Win32/Autorun.Agent.JM Worm
Thats usually a pen drive virus (or any dervice that can autorun). As soon as you put an infected pen drive into your computer it copies alot of sensitive information (like passwords, settings or configs etc) onto the removeable secretly.
Disabling 'Autorun' fixes this.
http://www.scribd.com/doc/2353773/Step-By-Step-Ma...lete-Autorun-Virus
Goooooood Luck.