I found the following message from Avast antivirus - C:\USERS\(my name)\APPDATA\LOCAL\TEMP\MSUPDATE71\indexer.exe. Avast recognise it as a Win32:Malware-gen. Threat was detected and blocked.
This message pops up very often. I ran quick scan, deep scan and boot scan. Avast identifies the file as malware, but is not able to delete or vault the threat (The operation is not supported for this type of archive).
Any help will be appreciated.