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.