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Fix Avast won’t open and other errors in Windows



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:
  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

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

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.

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Running outdated Windows versions may prevent other apps and programs from running properly.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

If you want to discover mode details about this great antivirus solution, take a look at our comprehensive guide.

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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This post was written by Ivan Jenic and was first posted to WindowsReport

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