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its maybe an autorun virus it disabled my task manager and when i click the d and c on drive in the pc it just pops out some new window and then it sometimes gets shutdown aotumeticaly and then i just installed the avg 8.0.1 (i think atleast) i have deleted it now when i open my computer then click d or c drive it just says me to select a program to open with now how can i get rid of that virus.or may i install vista and format the hole computer.and what can i do with this virus and is it a work of hacker and the virus came from a pen drive of my friend.please help me.

It sounds like a malware XP 2008/9 Go to this site for details. http://www.bleepingcomputer.com/malware-removal/remove-antivirus-xp-2008