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If this method also fails, please try the following one. After that, a window will pop-up and ask you to update the antivirus.

Find exe process and right-click on it.Right-click on the Taskbar and open Task Manger.Restart the system and try updating Avast software to check whether the error is removed.Ī Guide on How to Fix Avast Virus Definitions Won’t Update Fix 2.Click on the OK button and exit the box.Find Enable Avast Self Defence Module and unmark the box next to this option.From the list of options, navigate to Troubleshooting and click on it.From the Avast interface, click on the Settings.Disabling this module may help you solve the problem. The Avast Self-Defence Module in the Avast antivirus provides protection to the antivirus application itself. To solve the "Avast setup is already running" error, you can try the following methods. How to Solve "Avast Setup Is Already Running" Error If you try to end the task, the file may display message “The Operation could not be completed”.

This file runs in the background of the Task Manager. But the most common reason is related to a file called the instup.exe, which basically runs in the background of Windows to update the virus definitions and download them. You want to know what causes the "Avast setup is already running" error.

Avast is one of the most powerful antivirus programs available nowadays.