If you frequently use various USB devices on your system, change printers, or other internal or external hardware, the old hardware information is still in the registry. The cause of Windows getting confused over hardware is because Windows *thinks* the new hardware is installed and working but it really is not. The solution is the low-cost Advanced Hardware Editor. With AHE, you can easily remove the entries, change them and more. AHE even has an UNDO function to fix mistakes!