Fix Avast won’t open and other errors in Windows

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
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  • One of the most popular free antivirus solutions comes from a Czech company. It is called Avast and offers solutions for Windows, Mac, Android and iOS.
  • If you can't open Avast, you need to start the Repair operation from the Control Panel. Read on to find out exactly how to do this.
  • The antivirus errors section contains similar articles for correcting common errors from popular antivirus solutions.
  • Your digital life needs help from the best tools to be protected as it should. See our antivirus software section for more information.
avast antivirus bugs windows 10
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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.

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

avast fix

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 — some of them change their mind and switched to Windows Defender, but that’s a story for another day.

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.

What to 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

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 pop-up messages in the down right side of your screen saying something like “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 below.

First things first, we’re going to try to disable Avast Antivirus and then re-enable it  in order to force Windows 10 to recognize it:

  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. But if the issue is still present, you have one more option to try. Here’s exactly what you need to do:

  1. Right-click on the Start Menu and choose Command Prompt (Admin)
  2. In the Command Prompt type winmgmt /verifyrepository > hit Enter. avast antivirus windows 10
  3. If you get WMI repository is consistent -no problems detected, type ‘winmgmt /resetrepository’ and press Enter.
  4. If you get WMI repository is inconsistent -problems detected, type ‘winmgmt /salvagerepository’ and press Enter.
  5. If you get WMI repository has been salvaged – WMI repository has been successfully rebuilt,  continue to the last step.
  6. Now reset your computer.

2. Avast Causes Black Screen in Windows 10

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 following solution:

  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



  4. Restart your computer.

After that, you shouldn’t face the black screen issue anymore. But if you do, maybe the problem is not related to Avast, so I recommend you to check our article on how to fix screen problems in Windows 10 for additional solutions.

3. Process Trust Error During Avast Installation

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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

Sometimes, Avast may fail to update its virus definitions. This is quite a major issue since it leaves your computer vulnerable to the latest threats.

If you can’t install the latest Avast updates, follow the suggestions listed below:

  1. Update your OS — running outdated Windows versions may prevent other apps and programs from running properly. Go to Settings > Update & Security > Windows Updates > check for updates.check for updates
  2. Temporarily disable your firewall/ VPN. Sometimes, your firewall may prevent you from installing the latest software updates on your machine. Go to Start > type ‘firewall’ > double click on ‘Windows Firewall’. Click on the option ‘Turn Windows Firewall on and off’ > turn off firewall firewall disable
  3. Clean boot your computer. This solution allows you to start Windows 10 using a minimal set of programs and drivers. Software conflict may also block Avast updates. This workaround helps you eliminate software conflicts as a potential cause for this problem. Here are the steps to follow:
    • Type System Configuration in the search box > hit Enter
    • On the Services tab >  select the Hide all Microsoft services check box > click Disable all.
    • On the Startup tab > click on Open Task Manager.
    • On the Startup tab in Task Managerselect all items > click Disable.disable startup programs
    • Close the Task Manager.
    • On the Startup tab of the System Configuration dialog box >click OK.
    • Restart your computer and try to update Avast.

5. Avast won’t start

If Avast fails to load, you can try to repair the software. Go to Start > type ‘control panel’ > launch Control Panel > go to Programs > Uninstall a program >  Select Avast > Select Repair.

repair avast windows 10

When the process is completed, you can restart your computer and check if the issue persists.

If Avast still won’t open, you can also use the solutions suggested to fix Avast update issues.

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.

FAQ: Learn more about Avast and some possible errors

  • Is Avast Antivirus good?

Avast has been on the market for a very long time. It was always somewhere in the top choices for it’s scanning engine and gained popularity because it offers a pretty good free version. Check out our top free antivirus list and see what we think.

  • How do I register Avast?

New versions don’t require a registration key any longer. If your current version says the registration is expired, it will continue to work. However, we suggest you download and use the latest version.

  • How do I uninstall Avast Antivirus?

The process of uninstalling Avast is just like any other piece of software. Using the add remove programs to run the uninstaller. If it doesn’t work, use special software to uninstall.

Editor’s Note: This post was originally published in March 2015 and has been since completely revamped and updated in May 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in March 2015 and was revamped and updated in July 2020 for freshness, accuracy, and comprehensiveness.
  • 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?