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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 to install it again but can be used for removing Avast entirely.

You can uninstall Avast Antivirus using two different methods:

Barracuda RMM Support Note

Before reinstalling by the below methods, please ensure the device that has the Avast AV policy has that policy disabled or excluded. After doing the below steps, please re-enable the policy after 60 minutes and push out the AV install as brand new.

Automated uninstall
  • From the left side Nav Menu, select Antivirus
  • Then Avast Antivirus
  • Click on Deployment
  • Select the Site
  • Then the Number of Devices labelled Devices with Antivirus Installed
  • Select the Devices and Uninstall
  • Proceed to the Remove the remnants on each device procedure
  • If this does not work, please create a Script in Automation using the ps1 from Avast found here
    • Please note: Run this script above from Avast only when it is optimal to restart, as the script will cause a device to restart automatically
    • The Barracuda RMM Support Team does not offer support for using the Avast script from above
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
    • Not necessary, though recommended, if devices are problematic in removing files and folders
  • 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_LOCAL_MACHINE\SOFTWARE\WOW6432Node\AVAST Software
    Computer\HKEY_LOCAL_MACHINE\SOFTWARE\AVAST Software
    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 with 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 60 minutes have transpired, apply the AV policy again. If not, wait 30 minutes to ensure the policy is cleared
  • Push install back out through the Avast Antivirus dashboard in Barracuda RMM
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