To show all of the Devices including hidden ones in the Device Manager, follow these steps:
1. Open the Registry and look for this string: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ Session Manager\Environment 2. Right-click on an empty space in the right pane 3. Select 'New->String' and name it: DEVMGR_SHOW_NONPRESENT_DEVICES 4. In the Value box type in 1 and click OK