Error Code 0x004ff91 – Guide – Steps to Fix

How to fix Error Code 0x004ff91 with error message with Windows in Security, Microsoft Security Essentials, Windows Defender while Installing, updating?

Causes of Error Code 0x004ff91: Error Code 0x004ff91 is an issue caused due to improper maintenance of the Windows and installed software. This Error Code 0x004ff91 occurs while installing | opening | closing | updating | uninstalling | removing the application or Windows upgrade. 

Error Code 0x004ff91 in Windows, Calendar, Moviemaker, Media, Visio, Exchange, Project, BSOD, Boot, .Net, Driver, Printer, Edge, Explorer, Scanner, Security, Microsoft Security Essentials, Live mail, Office, OneDrive, OneNote, Word, Excel, Outlook, Powerpoint, Defender, Store of version 2010, 2013, 2016, 2019 ,365 while downloading, installing, uninstalling, opening, loading, updating, closing, activating, syncing, logging, in, downloading, printing.

Solution to fix Error Code 0x004ff91?

SUMMARY: For Error Code 0x004ff91, like any problem with a software, which is like a machine, it is investigated for overall issues and then fixed one by one. First, we check the list of software installed in Windows to relate if it can cause the fault. Then, we check the fault logs from the event viewer to see if we can relate it to any of the known faults or applications. Next, we can cripple the applications we suspect in the first two steps and check if the error is resolved. If the error is not fixed, we will then disable al the security software, clean up the junk files to overrule possibility of low space in the hard drive, try a quick repair first, then a normal repair and if still not resolved, we will perform a full uninstallation and then install it again.

PLEASE NOTE: SAVE OR BOOKMARK THIS WEB PAGE LINK OR URL, AS THIS INVOLVES RESTARTING THIS COMPUTER.

 

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Steps to fix the Error Code 0x004ff91:

Table of Contents :

 

 

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How to Clean Temp Files?

Temp files are the files used to store non-permanent information}. Most programs store such kind of data leading to shortage of disk space. To reclaim the disk space, we can remove these temp files. Normally the Computer itself removes these files, but we can also do this ourselves.

Following are a few methods used for temp file clean up

Method-1-Using Temp Folder

  • Type Run on the search bar at the left bottom corner of your Computer or Press “Windows Key + R“, to open command box. A command box will pop-up at the left bottom corner , then type “%temp%” and click OK.

  • We will get the Temp folder now, this folder containing all the Windows System temporary files and folders. At the top of the current window click on view and check Hidden items.

  • Select all the files and folders by Pressing “Ctrl + A“.

  • To Permanently delete all these data, hold down “Shift + Delete“, or simply right click the selected items and then press Delete to confirm the removal and then empty Recycle Bin.

  • Now, all the temp files are Cleaned up and free space will be available.

Method-2-Using Command Prompt

  • Type cmd on the search bar at the left bottom corner of your PC, open command prompt in admin mode by pressing “Run as Administrator” and click Yes on the pop-up window.

  • In the Command Prompt, type “del /q/f/s %TEMP%\*” and then hit Enter.

  • This will remove all temporary files in the “Temp” folder on Windows PC.

Method-3-With System Settings

  • Click on the Windows key at the left bottom corner of your Computer and click Settings.

  • From Settings Menu, select System tab and then click to open.

  • From the System pane at the left side of window, press storage tab.

  • Open storage tab and you will see available local disks. From that available local storage press the one you want to clean up.

  • From storage options, select and open Temporary files.

  • From the listed files, select items except Recycle Bin and Downloads to be deleted and press Remove files.

    • The Temp files will be deleted.

 

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How to Disable Antivirus?

Antivirus is kind of application used in computers or Laptop devices for the need of scanning, detection, prevention, protection and elimination virus or harmful software. In the background, these software runs itself and provides real-time protection.

There are two types of Antivirus software in Windows Operating System, one is in-built Windows Defender and others are developed by other firms and provides their own unique and advanced features. Few examples for other Antivirus software are the following:

Kaspersky, Norton, Trendmicro, Avg, Avira, Avast, McAfee, Zonealarm etc….

When installing any other applications or software, it might not be easy for Antivirus to find whether the application or software is legitimate or spiteful, So it is greate to disable Antivirus while installing any other desired software.

Each Antivirus software is dissimilar and you must be careful while disabling these, describing how to disable few widely using Antivirus softwares.

How to Turn off Windows Defender

Windows Defender is Default Antivirus software and we could easily and simply turn off this one. Below elaborated steps can be followed

 

 

Method-1-If The System Is Not Updated
  1. Click on the search bar at bottom corner of the PC and type Run or PressWindows Key + R” to open command box.
  2. A command box will pop-up and type “gpedit.msc” and select OK.
  3. Local Group Policy Editor will open up, from that press on Administrative templates.
  4. From dropdown select Windows Components and scroll down to find  Windows Defender Antivirusclick on that.
  5. Settings menu will show up, from that double press  Turn off Windows Defender Antivirus.
  6. There will be three options like Not configured, Enabled & Disabled.
  7. Click on Enabled and click apply and then OK.
  8. Now, close all the Windows and restart Computer. Now, the default Antivirus Windows Defender will be disabled.
Method-2-Using Settings ( Temporary )
  1. Click on the windows icon on the left bottom corner of the PC.
  2. Select Settings tab and from that select Update & Security tab.
  3. In Update & Security menu from the options given on left side select Windows Security.
  4. In Windows Security , at the top Select on open Windows security button.
  5. There on, this window we could see so many options from that select each one and turn them off.
  6. Click on Virus & threat protection and under Virus & threat protection settings, click on Manage Settings and disable Real-time Protection. Please note that this is temporary and once you have restarted your Computer, it will turn on automatically.
  7. Then on the left side given menus select Firewall & network protection from its menu you will see options like Domain network, Private Network, Public Network Select each one and turn them off.
  8. Now the default Antivirus Windows Defender would be disabled temporarily.
Method-3-Using Registry Editor ( Permanent )
  1. Click on the search bar at bottom corner of the Computer and type Run or PressWindows Key + R” to open command box.
  2. A command box will pop up and type “regedit” and click and then click YES on the pop-up, you will get Registry Editor.
  3. From Registry Editor, click on HKEY_LOCAL_MACHINE from drop down click on SOFTWARE and then click on policies and then click on Microsoft and then Windows Defender.
  4. You will see Default file on the right hand side of the window. In that window, right click on any empty space, you will get an option says New and from that select ” DWORD (32bit) bit ” and you will get an option to rename that , Rename that as ” DisableAntispyware “. It will listed under Default file as a new one.
  5. Once done creating DisableAntispyware click on that and will get a pop-up which will show options to change its values , so then change the value to ” 1 ” by removing ” 0 ”  and then click ok and then restart Computer.
  6. Now, your Windows Defender will be turned off permanently.

How to Turn off Kaspersky Antivirus

Method-1-From Taskbar
  1. On the taskbar, search for the Kaspersky icon, it may be like green shield with a check mark
  2. If you are not able to find symbol there, click on the icon tray which shows hidden icons at the right bottom corner of the PC
  3. Right Click on the Kaspersky icon , A menu will appear there from that select Pause Protection
  4. On Pause Protection, you will get three Pause options pause for particular time (here you could choose time), Pause until application restarts and Pause
  5. Now, you have successfully disabled the Kaspersky Antivirus.
Method-2-Using Main Application Window
  1. Click on the Kaspersky application main window to launch it
  2. From the main menu, click on the Protection and Control tab and select Protection tab
  3. On Protection, right click and you will get another menu to select disable/enable Antivirus
  4. To disable Kaspersky Antivirus, select the Stop option from the menu.
  5. Now, you have successfully turned off the Kaspersky Antivirus.
Method-3-Using Application Settings Window
  1. Select Settings Window and click to open it.
  2. At the left end of the window, there will be Antivirus protection section, select Antivirus tab.
  3. At the right end of that window, there will be the File Antivirus section.
  4. Turn off Enable File Antivirus button and click on Save to save changes
  5. Now you have successfully  disabled the Kaspersky Antivirus.

How to Disable McAfee Antivirus

Method-1-From Taskbar
  1. On the taskbar, search for the McAfee icon. It might be dark red in color
  2. If you are not able to find icon there, click on the icon tray which shows hidden icons at the right bottom corner of the PC
  3. Right Click on the McAfee icon, a menu will pop-up there from that press Change settings
  4. Click on Change settings you will get a Menu, from that select|click|press} Real-time Scanning
  5. MacAfee Antivirus Application will open and pop-up with options to turn on or OFF Real-time Scanning 
  6. At the right  side of the window, click on Turn Off and another window will appear and, in that, at the left side of the window on a text box, you can choose when to resume Real-time scanning.
  7. After choosing the time at the right side of the window, there will be a blue Turn off  button. Click on that and close the window.
  8. Then, repeat steps 2 and 3 below Real-time Scanning. You will get Firewall option, Click on that.
  9. Click on Turn Off button and choose time and turn off firewall.
  10. Now, you have successfully disabled the McAfee Antivirus.
Method-2-Using McAfee Application
  1. Click on the search bar at bottom corner of the PC and type McAfee  the installed application will open.
  2. On main window of McAfee Antivirus software at the right top corner, you can see the Settings icon. Click on that.
  3. In Settings under the dropdown, select Real-time Scanning under PC Security Section.
  4. At the right  side of the window, click on Turn Off and another window will appear. In that, at the left side of the window on a text box, choose  when to resume Real-time scanning.
  5. After choosing the time at the right side of the window, there will be a blue Turn off  button. Click on that and close the window.
  6. Then, select Firewall tab below Real-time Scanning tab under PC Security tab.
  7. At the right  side of the window, click on Turn Off and another window will pop-up. In that at the left side of the window on a text box you can choose,  when to resume Firewall.
  8. After choosing the time at the right side of the window, there will be a blue Turn off  button. Click on that and close the window.
  9. Now, you have successfully disabled the McAfee Antivirus.
Method-3-Using System Configuration 
  1. Click on the search bar at bottom corner of the PC and type Run or Press “Windows Key + R” to open command box.
  2. A command box will pop-up and type “msconfig” and click YES on the window, you will get System Configuration.
  3. From System Configuration at the Top menu bar, click on Services.
  4. At the bottom left corner of this window, check for ” Hide all Microsoft services“.
  5. Under Services, scroll down and deselect all the services related to McAfee and click OK, then click on Restart.
  6. Your Mcafee Antivirus will be disabled after the restart.

How to Disable Norton Antivirus

Method-1-From Taskbar
  1. On the taskbar, search for the Norton icon,
  2. If you are not able to find icon there, click on the icon tray which shows hidden icons at the right bottom corner of the PC.
  3. Right Click on the Norton icon , A menu will appear from that, click Disable Auto Protect.
  4. A menu will appear, choose the duration and then select OK.
  5. Again, right click on the icon from the taskbar and select Disable Smart Firewall.
  6. A menu will appear, choose duration and then select OK.
  7. Now, Norton Antivirus will be disabled.

How to Disable Avast Antivirus

Method-1-From Taskbar
  1. On the taskbar, search for the Avast icon.
  2. If you can’t find icon there, click on the System tray, which shows hidden icons at the right bottom corner of the PC.
  3. Right Click on the Avast icon , a menu will appear from that click Avast Shield Control and then click on Disable Permanently
  4. Avast Antivirus will be turned off.
Method-2-From Main Application
  1. Click on the search bar at bottom corner of the PC and type Avast  the installed application will open.
  2. On main window of Avast Antivirus software at the right top corner, you can see the Menu icon. Click on that.
  3. Click Settings tab at right pane, click on Protection and then click on Core Shields.
  4. Scroll down and click on File Shield under Configure Shield Settings and uncheck Enable File Shield and choose the duration or Stop indefinitely  from the pop-up.
  5. Click on next tab Behavioral shield and uncheck Enable File Shield and choose any duration or Stop indefinitely  from the pop-up.
  6. Then Click on the next tabs Web shield and Mail shield and for both uncheck Enable File Shield and choose theduration or Stop indefinitely.
  7. Simply at the top of the window you can turn off Core shield and choose theduration or select Stop indefinitely.
  8. Avast Antivirus will be disabled.

How to Disable Avira Antivirus

Method-1-From Taskbar
  1. On the taskbar, search for the Avaira icon.
  2. If you are not able to find icon there, click on the icon tray, which shows hidden icons at the right bottom corner of the PC.
  3. Right Click on the Avaira icon, a menu will appear from that select Turn off real time protection and then choose the duration.
  4. Give administrative permission by clicking yes on that pop-up.
  5. Avira Antivirus will be disabled.
Method-1-From Application
  1. Click on the search bar at bottom corner of the PC and type Avira,  the installed application will open.
  2. Click on the Security tab on the left pane and select Protection options .
  3. Click Turn off  under Real time protection and from appearing window choose time and click on blue color Turn off tab.
  4. Do the same for all under Protection options.
  5. Avira Antivirus will be disabled.

 

 

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How to Check Windows Updates?

To keep your Windows Device Sooth, Fast and Secure , The system has to be updated. Once in a while Microsoft provides Particular Updates.

  • Click on the Start Button at the left bottom corner of the desktop window.
  • Click on Setting at the left pan.
  • Click on Update and Security , the tab will be at the end of the menu.
  • Then Click on Windows Updates, and select Check for updates tab.
  • The system will check updates and if there is any latest updates available it will show up and download and install.
  • Also you could configure the installation by clicking Advanced Options , here you could choose how updates are installed.

Windows Update issues

when updating Windows, you may face some issues like  Interruption, slowness, or it might end up with Some error codes. You can try these Troubleshooting steps.

  • Basic Windows Troubleshooting Steps
  1. We need to Free up some space first.
  2. Click on the Windows Key at the left bottom corner of your Pc and  choose Settings.
  3. From Settings Menu, click System tab and click to launch.
  4. From the System window at the left side of window, select storage tab.
  5. Open storage tab and you will see available Local disks, from that available local storage select the one one you want to clean up.
  6. From storage options, select and open Temporary files.
  7. From the listed files select items to be deleted and click Remove files.
  8. Save and Close all the finished and unfinished works and restart the Computer.
  9. Check for Windows updates , Restart the PC again.
  • Additional Troubleshooting Steps
  1. Keeping necessary hardware, unplug or disconnect unnecessary hardware.
  2. On search bar, type Device Manager and click to open it.
  3. Click on dropdown for each tab and check for Caution/warning symbol, it might be an exclamation mark inside a yellow triangle.
  4. If you can find any device with that , right click on that and select Update driver
  5. Check for Windows updates , Restart the Computer again.
  • Using Windows update troubleshooter
  1. To get the most updated troubleshooting tool, type “aka.ms/wudiag” on the search bar.
  2. Click Open and run the file, then click Next.
  3. From the pop-up window, click Apply this fix.

 

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How to Repair Microsoft Office?

 

Microsoft Office is a productivity application which contains applications like Microsoft Word, Microsoft Excel, Microsoft PowerPoint, Microsoft OneNote, Microsoft Outlook, Microsoft Publisher, Microsoft Access, Skype for Business, Microsoft InfoPath. Office applications Plays major part in creating, analysing and modifying various documents in our day to day life. It supports Home as well as Business users to improve or ease tasks as well as productivity.

Microsoft Office Applications

Microsoft Office Repair

Office applications may undergoes somany problems, We may face errors while installing or Running. We could try options like quick repair or online repair as a basic solution for such kind of issues.

 

Office Quick Repair / Online Repair
  1. Click on the Windows Icon on the left bottom corner of the Pc. fFom the left pane, choose Settings.
  2. Click on Apps and choose Apps & Features from the left pane.
  3. Scroll down and choose Microsoft Office version you have and click on “Modify“.
  4. Before repairing, do not forget to close all Office applications.
  5. A window will appear. From that, choose Quick repair (repairs without internet)/ Online Repair (repairs with internet).
  6. You cannot access any Office application while repairing.
  7. Once the repair is done, you will get a message. Then, close all the window and restart your Computer.

Microsoft Office uninstallation

  1. To uninstall Office , we can} use Office uninstall Support tool. Press on the download button to get the tool from Microsoft Official website.
  2. The tool will be downloaded and it will be available in the downloads folder. Right click on that and run it as administrator.
  3. Select the Office version and press Next.
  4. Few pop-up windows will appear, go through the instructions and then restart your Computer.
  5. Once restart is done, the uninstall tool launches again and finishes the final repair.
  6. Then choose the Office version you need to install or reinstall then close all the window.

Microsoft Office Installation
  1. Visit https://www.Office.com from your favorite browser or select here .
  2. Office available for both Home as well as Business use, you can compare the pricing and packages included on Official Ms Office Website mentioned above  by clicking Get Office
  3. You will get Microsoft Office Home page, click Sign in if you already have Office subscription.
  4. Enter your Username and Password, click sign in. You will be redirected to authenticated window of Office . you can see a Install Office button over there, click on that.
  5. It will lead to Install page , click on Install Office button under Install Office on your computers tab.
  6. You will get a pop-up menu, there you can select language as well as versions by selecting other options, then click install. This is for Microsoft Office 365 and Microsoft Office 2021.
  7. If you are going to install Office versions like Microsoft Office Office 2019, 2016, 2013 etc… with your Product key, Go to, https://setup.office.com/ or click here.
  8. There you will see three easy steps to finish the task.
  9. First, login to your Office account and then enter your product key. After that simply download Office Setup.
  10. The Setup file must be in downloads folder, right click on the file and choose Run as administrator.
  11. Click YES on prompt menu, for administrative permission. Allow the installation to run.
  12. Once the installation completes, you will get the message “You’re all set! Office is installed now” and click close.

Microsoft Office Activation
  1. Search and choose any Office Application. For Example open Excel.
  2. You could see a license agreement when the app opens for the first time, Accept that and your Office will be ready to use.

 

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    Error Code 0x004ff91 – Guide – Steps to Fix
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