I recently had great problem of autorun.inf file viruses......one of such virus attacked my pc trough my friends pen drive....i am having AVG Antivirus but still it was not able to detect threat in pen drive ...I tested that virus on famous Anti-viruses such as AVG, kaspesky, Quick heal & bitdefender but none was able to detect that...It make huge changes in my registry files...until i found this small 1.5mb USB_Autorun_Virus_Remover_2.3 utility