It's a virus.
Plug in your thumbdrive and hold down the Shift key to prevent it
from auto running.
Open Command Prompt (Start > Run and type in cmd).
In Command Prompt, type in the following line by line, pressing
Enter after each line:
X: (replace X with the correct drive)
dir /s /a:h > %systemroot%\look.txt
start notepad %systemroot%\look.txt
Look at the notepad results
You may find some unknown files there. temp1.exe, temp2.exe,
autorun.inf. Delete all unknown files this way
del /q autorun.inf (this one must go)
del /q file (any unknown file found)
After you've deleted the files, type in exit and press Enter to
exit.
You will need to restore the functionality of your hard disks that
may be damaged by the viruses.
http://www.techsupportforum.com/sectools/sUBs/Flash_Disinfector.exe
Restart your computer after running the tool.