*Now go to Start--> Run and type cmd to open the Command Prompt window .
*Now go to My Computer and Check the Drive letter of your USB drive or Pen Drive.
( E.g. If it is written Kingston (I), then I: will be the drive letter .)
*In the Command Window ( cmd ) , type the drive letter: and Hit Enter .
*Now type dir/w/o/a/p and Hit Enter
*You will get a list of files . In the list , search if anyone of the following do exist
1. Autorun.inf
2. New Folder.exe
3. Bha.vbs
4. Iexplore.vbs
5. Info.exe
6. New_Folder.exe
7. Ravmon.exe
8. RVHost.exe or any other files with .exe Extension .
If you find any one of the files above , Run the command attrib -h -r -s -a *.* and Hit Enter.
Now Delete each File using the following Command del filename ( E.g del autorun.inf ) .