Support: Troubleshooting a computer crash or blue screen error (BSOD)

How to troubleshoot a computer crash


In some cases, Avast software products may conflict with third party software installed on your computer, causing Windows to crash, freeze, or show a blue screen error (BSOD). This can be due to programs you run manually, or background services which run silently when you start Windows.


To determine if the problem is caused by background services, please follow the procedure below.

  1. Reboot your computer and start Windows in Safe mode according to the instructions in the following article:
  2. When Windows is running in Safe mode, simultaneously press the Win + R keys on your keyboard to open the Run dialog box.
  3. In the Open field, type the command msconfig.exe and click OK to open the System Configuration utility.
  4. Click the General tab and select the Diagnostic Startup option to clear all startup programs.
  5. Click the Services tab, and tick the checkboxes related to your Avast Antivirus services:
    • Avast Premier or Avast Internet Security - tick Avast Antivirus and Avast Firewall.
    • Avast Pro Antivirus or Avast Free Antivirus - tick Avast Antivirus.
  6. Go back to the General tab where Selective Startup is now selected. Click OK and restart your computer when prompted.
  7. If your computer starts working normally again, the problem is due to a conflict with another program or service running silently in the background. For detailed instructions on how to report these issues to Avast Technical Support please read the following article:
  8. To configure Windows to start again in Normal startup mode, run the System Configuration utility and select Normal startup under the General tab.
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  • All supported operating systems

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