Since there is no driver required for these operating systems, the device uses the built-in driver (USB Mass Storage Class Driver) from these operating systems. If your operating system cannot find the device, then it is possible that the built-in driver files were missing or corrupted; please try to recover these files from another computer or from the original Windows operating system CD. You should also verify your system OS has the most up-to-date service packs. Should you still have a problem, please try removing and re-installing the device though Device Manager or contact our technical support center.