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Barracuda MSP Knowledgebase

Cleanly reinstall Avast Antivirus

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From time to time, Avast Antivirus might need to be removed. This can be because an end customer no longer wishes it on their system or simply for remediation steps from troubleshooting. This knowledgebase was written with the intention to install it again but can be used for removing Avast entirely.

You can uninstall Avast Antivirus using two different methods:

Automated uninstall
  • Select Avast Antivirus Dashboard.
  • Select Deployment.
  • Select the Site.
  • Select the Number of Devices labelled Devices with Antivirus Installed.
  • Select the Devices and Uninstall.
  • Proceed to the Remove the remnants on each device procedure.
Manual uninstall
  • Either pull the policy from the Service or exclude devices in the policy.
  • Get onto the end device and uninstall locally from Add or Remove Programs.
  • Proceed to the Remove the remnants on each device procedure.
    • Avast also has a clear tool that is available from their support website
Remove the remnants on each device:
  • Reboot the device in safe mode.
  • Delete the following Directories:
    C:\Program Files\AVAST Software
    C:\Program Files (x86)\AVAST Software
    C:\ProgramData\AVAST Software
  • Delete the following Registry Keys
    Computer\HKEY_USERS\S-1-5-18\Software\AVAST Software
    Computer\HKEY_USERS\.DEFAULT\Software\AVAST Software
You can likely download a utility like REVO or CCleaner to assist this step (however, Barracuda RMM Support does not assist with these)
If you intend to reinstall Avast, please do the following:
  • Reboot again to make sure it is cleared out.
  • If 30 minutes has transpired, apply the AV policy again. If not, wait a full 30 minutes to ensure the policy is cleared.
  • Push install back out through the Avast Antivirus dashboard in Barracuda RMM.
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