similar to what daz said...
im doing an IT networking course and I grabbed a batch file from tafe that clears the autorun.if
its pretty helpful for getting rid of the autorun.inf files which go around a lot at tafe because of all the students with usb's
anyways... copy and paste the following code (in between the ---) into notepad and save it as ClearInf.bat
rem @echo off
echo Copy this file to the top level of the disk or USB from
echo which you want to remove the Autorun, then run it
echo press Ctr C to stop now, or Enter to continue
attrib -r -s -h Recycle /s /d
attrib -r -s -h autorun.inf
attrib -r -s -h /d /s "Recycle\P-1-3-64-8794238531-8742492-9897532"
del autorun.inf /q
and as the note says, put the bat file in the root level of your usb.