Steps in cleaning the autorun.inf virus from the USB drive:
1.Download a software named flash disinfector.Its available of free download and install it in any non windows drive.
2.Install it,then during the run time,it will ask you to insert your USB drive and insert the drive.
3.Clicking on your drive will make your Desktop blank,don't worry,actually its temporarily locking all of your process and cleaning the autorun.inf file.
5.It will surely remove the autorun virus and yet its a partial removal only.As I said above it will not completely remove the virus,but will partially disinfect it and then lock the virus and keep it in a separate file in your USB drive.
6.Don't delete that file,otherwise the virus may unlock and reenter into your drive again and can infect your system.
Note:The infection of this virus creates multiple folders in your pc named as newfolder and you cannot delete that folder.Even some antivirus can't find it.It will use up many of your disk space and will drink lots of your cpu utilization and then slowly enters into the windows registries and creates fake keys and changes the access control from the administrator(you) to the virus,you pc will get slowed down and crashed frequently and finally your windows might get corrupt,so its safe to demobilize this virus/worm as soon as possible.