2. See Hidden Files Form Pen Drive Contains Virus :

Solution:

Follow the following steps:
1)Press Ctrl+Alt+del,and go to processes,end the explorer process.
2)Press new task,and type cmd to open command prompt
3)Go to c: (rootlevel) drive and type dir/ah,u can see a file autorun,
delete it using del filename /a/s/f/q,also see if any unknown exe file is present there delete that too.
4)No go to C:\Windows\System32,press dir /ah and look for the same exe file as hidden file,delete that and any .dll file with same name.Remeber the exe file name,it's the virus.
5)Go to every drive and repeat the same procedure.If any pendrives are connected,repeat the same procedure there too.
6)Go to regedit,by pressing newtask in the taskmgr,open Hkey_Local_Machine,then select software,now press edit and type the virus name and do search & delete.
7)Close regedit and open msconfig in taskmgr,select startup and unchk any file u think is associated with virus(generally not a system process)
8)Restart Explorer by typing explorer in newtask in taskmgr.

please follow the above steps for good solution.