Access is denied” when you try to stop the process. You will see a dialog box saying “The Operation could not be completed. This file is continuously updating the definition of the virus.

The reason that leads to the “Avast setup process still running ” problem is the “instup.exe” is running in the background. Causes Responsible for “Can’t Uninstall Avast Setup is Already Running” Problem: Just check out this article from top to bottom where the solutions to get rid of the Avast setup still running problem have been discussed in brief. So, if you are one of the users who is facing this problem, then do not worry. In this window, there are no troubleshooting methods to solve this problem. By pressing this button, the Avast Log Viewer will appear. Within this prompt appears, you will get to see a button for “View log”. The message reads “Setup is already running. Instead, they encounter an error message “Avast setup is already running” which continuously pops up on the screen. Many Avast users have reported that when they are trying to update or uninstall the Antivirus software, they fail to complete the process.