Hi LookinAround and others. Hope its not too late to get in on this conversation as I'm having what seems to be the same problem kimjaezie had a while back and its been going on for quite a while. At least three separate USB devices have this problem across all USB ports on my Windows Vista 32 bit OS. I don't think System Restore is the way for me to go. I do think the options listed from post 15 down could save my day as my missing files seem to match kimjaezie's. I believe this is where it is supposed to be: C:\WINDOWS\system32\drivers\usbstor.sys However I don't see either of these guys: C:\WINDOWS\inf\usbstor.inf // C:\WINDOWS\inf\usbstor.pnf in the INF folder (I had previously gone in there and deleted the Infcache.1 file as some other forums suggested it could be corrupt. It rebuilt itself but the problem remains. Do your recommend the hashtag utility for generating checksums or should I just copy these files onto a flashdrive from a friends Vista 32 bit SP2 computer and paste into mine? Thanks!