I am running XP pro. I purchased my Cruzer mini 1.0GB, plugged it into a usb on the main computer but could not get Explorer to recognize the drive. It will light up occasionally and sound is heard (dum dum + dah dum)plugging in and unplugging. It does have info on it in which I added by plugging into my laptop. I also renamed the drive Cruzer_1GB. It has no problems at all when used on my laptop or my spare pc (which all use xp pro) to exchange info. My main computer recognizes my Cruzer Titanium 512MB and assigns it a drive letter. When I place both Cruzers side by side in laptop or my spare pc, it recognizes both, assigns different drive letters and exchanges info with no problems. Obviously, its must be a setting of some sort. Please help.