Taken from another forum.
first run your system in safe mode, then go to your my computer properties and enable the system restore function.
then restart your computer and run in command prompt mode. in the command mode type the following.
ATTRIB Autorun.inf -H -S -R.
if the file is found in the Drive then give.
<similarly you can do it for all drives. but you have to restart your system for each drive.>