If none of these work, then the issue may be due to a file that has to be deleted following which, the update must be restarted.
This document, titled "Avg free - update failed," is available under the Creative Commons license.
If you've noticed Firefox running slower after updating AVG, AVG may be blocking access to Firefox until after it has completed its scans of Firefox.
Updating Firefox or resetting Firefox may solve the problem.
You may need to contact AVG's support if the problem continues after troubleshooting AVG and Mozilla Firefox.
Check AVG's settings to ensure Mozilla Firefox is not on a restricted programs list for Internet browsing. It is possible settings changed when you updated AVG.
It also changes any themes back to their default state, allowing you to check if which, if any, of these elements are causing the problem.Whenever I press the settings button in the lower right corner (windows 8) it just closes and nothing happens.When I go to the "This PC" tab it takes about a minute to show my drives and folders.The user can update this software; however, the update process may fail and it may show an error message such as, connection with update server failed.There are three options to solve this issue with AVG Free.