this problem is due to a virus.
it create an autorun.inf file in the root of drives.
the autorun.inf file contain the code to execute the virus.
if we delete the file its good.
but in case the file is not visible id c:\ d:\ e:\ .... drives.. we can manually create a file with same name and extension.
the file should be blank and contain no text.
heres a copy of the file in attachment.
unzip and paste the file (autorun.inf) in your main drives .. eg c:\....
and then restart your computer.
if it works... its fine... if not
just mail me at
loveshoby@eml.cc and i have a file which can help you out for sure.

keep your anti virus updated to avoid further inconvinence.
bye
take care
hey u in jodhpur?
great..
i m n japur