UserLock Documentation
UserLock Documentation

UserLock Frequently Asked Questions

An error occurs when installing UserLock on a machine with Avast Antivirus

When trying to install UserLock on a machine protected by Avast Antivirus, the following error 0x80070020 occurs just before the end of the installation:

UserLock Installer Information

This issue is due to Avast Antivirus. As a workaround, you can:

  1. Disable temporarily Avast Antivirus using its option provided for this purpose.

    • Right-click on the Avast Antivirus icon in the Windows task bar.
    • Browse through Avast menu 'Avast shields control' and click on 'Disable for 10 minutes'.

    Ten minutes will be more than sufficient to perform UserLock installation.

  2. Perform the UserLock installation.


This error was detected with the 2016-06-21 version of the the Avast Antivirus definitions' file.