Set windows to show hidden extensions file's and folder's.
click for> instructions.
save these instructions to a text for later referance
Reboot into safe mode Click here if needed For instructions.
go start run copy then paste in the bolded line below and press enter
C:\Documents and Settings\All Users\Documents
delete setup.exe and autorun.inf if present
go start run type in
%temp%
delete the entire contents, its safe.
Delete these files if present
c:\autorun.inf
c:\setup.exe
c:\WINDOWS\system\smss.exe (carefull of spelling and location)
c:\WINDOWS\system32\nvsvcd.exe
restart back to a normal windows session. let me know of any problems.