XP computer can't detect USB flash drive, external hard drive or iPod

If you attach a USB device such as a flash drive, hard drive or iPod music player to your XP computer and scan for hardware, but your computer doesn't detect the device and it doesn't appear in the My Computer folder, it may be because some registry keys are corrupted. If that's the problem, you can fix it easily by clicking the Fix It button or following the instructions for manually resolving the problem in KB 925196 at Click Here