Fix Avast won’t open and other errors in Windows

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
Last update:
Affiliate Disclosure

  • Sometimes, one of the most popular free antiviruses, Avast, won't open if there are incompatibility issues with your PC.
  • A solution that worked for many users, is rebuilding the WMI repository.
  • If Avast is not opening on your Windows 10, make sure to check the firewall settings.
  • You can also try to repair the software. This process will fix corrupter files and might be helpful.
Avast won't open
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Have you tried to install Avast Antivirus on your new Windows 10 computer? Sometimes users may encounter some serious issues with the Avast software Windows 10.

The most annoying of them is the fact that Avast does not recognize the Windows system files as part of the operating system and tries to delete them.

This article will show you how to fix Avast issues on Windows 10 and what version of the antivirus to install.

Avast is one of the most popular antivirus programs out there. Many users who were using Avast on previous versions of Windows installed it on Windows 10, as well.

But even if Avast Antivirus is fully compatible with Windows 10, some errors may still occur. In this article, we’ll list the most common issues reported by users as well as their corresponding solutions.

It is worth mentioning that oftentimes Avast Antivirus users experience BSOD errors after installing the latest Windows 10 version on their computer.

This problem occurs due to incompatibility issues between Avast drivers and some CPU models. To avoid this problem, install the latest Avast version before upgrading your PC to the latest OS version.

For other Avast issues, follow the instructions listed below. We hope these solutions will be helpful to you.


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What can I do if Avast is not running on Windows 10?

  1. Windows 10 Action Center doesn’t recognize Avast
  2. Avast causes black screen in Windows 10
  3. Process Trust error during Avast installation
  4. Avast Antivirus won’t update
  5. Avast won’t start

1. Windows 10 Action Center doesn’t recognize Avast

  1. Right-click on Avast icon in your taskbar.
  2. Go to Shields control and choose Disable for 10 minutes.
  3. After that, enable it again the same way, and selecting Enable all shields. This should help Windows 10 recognize Avast, and the above-mentioned messages shouldn’t bother you anymore.
  4. But if the issue is still present, open the search bar and type cmd.
  5. Choose Command Prompt (Admin).
  6. In the Command Prompt type the following command and hit Enter:  winmgmt /verifyrepositoryavast antivirus windows 10
  7. If you get WMI repository is consistent -no problems detected, type the next command and press Enter: winmgmt /resetrepository
  8. If you get WMI repository is inconsistent -problems detected, type another command and press Enter: winmgmt /salvagerepository
  9. If you get WMI repository has been salvaged – WMI repository has been successfully rebuilt,  continue to the last step.
  10. Now reset your computer.

One of the most frequent issues with Avast on Windows 10 is when the Action Center doesn’t recognize Avast.

If that happens, you’ll probably receive a pop-up message saying: Windows Defender and Avast Antivirus are both turned off, or Windows did not find an antivirus program.

Fortunately, there’s an easy solution for this. You just need to follow the steps above to rebuilt the WMI repository.


2. Avast causes black screen in Windows 10

  1. Click on Avast icon in the taskbar and open Avast user interface.
  2. Go to Settings tab, and then to General.
  3. Go to Exclusions options, click add and add the following address to exclusions:
    C:\Windows\Explorer.exe

    and

    C:\Windows\ImmersiveControlPanelSystemSettings.exe
  4. Restart your computer.

Some users also reported that installing Avast on Windows 10 caused black screen issues. This is not a common issue, but if you experienced it, you can try the above solution.

After that, you shouldn’t face the issue anymore. But if you do, maybe the problem is not related to Avast, so I recommend you to check our dedicated article for additional solutions.


3. Process Trust error during Avast installation

Run a System Scan to discover potential errors

Restoro Scan
Click Start Scan to find Windows issues.
Restoro Fix
Click Repair All to fix issues with Patented Technologies.
Run a PC Scan with Restoro Repair Tool to find errors causing security problems and slowdowns. After the scan is complete, the repair process will replace damaged files with fresh Windows files and components.

This error message sometimes appears when you’re trying to install Avast on Windows 10.

Namely, you’ll get Process Trust fatal error pop-up message saying Avast doesn’t trust Avast Installer. This means that you cannot install Avast on your computer.

This error appears due to a conflict between Avast and your current antivirus program. So, just disable your current antivirus (in most cases this is Windows Defender) and try to install Avast again.

This time, you shouldn’t experience any problems. This error will remind you that having two antivirus programs installed on your computer is not a good thing.


Windows 10 prevents antivirus installation? This is how you can fix the problem.


4. Avast Antivirus won’t update

Update your OS

  1. Go to Settings > Update & Security.
  2. Click on Windows Updates from the left pane, then select Check for updates button.check for updates
  3. Install all the available updates.

Running outdated Windows versions may prevent other apps and programs from running properly.

Temporarily disable your firewall/ VPN.

  1. Go to Start and type firewall.
  2. Double click on Windows Firewall.
  3. Click on the options Turn Windows Firewall on and off.windows firewall disable

Sometimes, your Windows firewall may prevent you from installing the latest software updates on your machine.

Clean boot your computer.

  1. Type System Configuration in the search box and hit Enter.
  2. On the Services tab select the Hide all Microsoft services check box then click Disable all.
  3. On the Startup tab click on Open Task Manager.
  4. On the Startup tab in Task Manager select all items and click Disable.disable startup programs
  5. Close the Task Manager.
  6. On the Startup tab of the System Configuration dialog box and click OK.
  7. Restart your computer and try to update Avast.

This solution allows you to start Windows 10 using a minimal set of programs and drivers. Software conflict may also block Avast updates. 

Sometimes, Avast may fail to update its virus definitions. This is quite a major issue but you can use our detailed guide to fix the problem.


5. Avast won’t start

  1.  Go to Start and type control panel.
  2.  Launch Control Panel and go to Programs > Uninstall a program.Uninstall_Control_panel
  3. Select Avast then Repair.
repair avast windows 10

If Avast fails to load, you can try to repair the software. When the process is completed, you can restart your computer and check if the issue persists.


That’s all, I hope this article covered all the major Avast errors that you may get in Windows 10, and that it helped you solve them, as well.

Also if you have additional questions regarding this subject, drop us a line in the comments section below and we will help you further as soon as possible.

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Frequently Asked Questions

  • Avast has been on the market for a very long time and it offers a pretty good free version. Check out our top free antivirus list to discover even more freeware solutions.

  • You can try to disable and enable it back. If this doesn’t work, check our guide on how to fix Avast won’t open and other errors.

  • To uninstall it go to Control Panel and proceed like with any other software.  If it doesn’t work, use any of these great uninstaller tools.

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for me the issue is that I cannot install Nvidia drivers at all while Avast is installed on my pc. even disabling it does not help. I don’t know where I can set it to enable Nvidia software to update the drivers… Anyone know?