I have 3 flash drives which have served me well for a while now. Since I upgraded Windows 7 from build 7000 to 7100, none of them will work. I plug them in, the drivers install and the little sound plays to let me know the system recognizes them, but none of them show up in my computer. Theres no error or anything, it even says device driver installed successfully. I checked device manager as well, and nothing appears there either. All 3 usb drives work perfectly on my laptop with both Ubuntu Linux and Windows XP.