all 4 USB drives quit working on my moms new laptop. not sure if it was a hardware error or software, but i still think vista sucks like a 14th street hooker.
cola, i had same problem, vista looks for drivers for usb drives that are driverless
to fix it go to C:\Windows\Inf and change INFCACH.1 to X_INFCACH.1 or just delete it. (you might have to right click and give your user full privilages)
Now go to device manager, find your usb drive with the yellow warning sign > update drivers > tell it to look in C:\Windows