Trojon in tuneup utilities!!!!
While I was using avast AV for virus protection, I got annoyed by repeated alarms after inserting any pen-drive.Then I just formatted the OS drive and reinstalled OS, replacing Avast with Kaspersky trial version.After this I started installing all those softwares that were previously used . While I installed the tuneup utilities, kaspersky gave me two warnings with one most vulnerable. There it shows the reason for that alarm by Avast. Anyway it is just fine now as I switched myself from tuneup utilities to others components(Logon studio,etc..).