1) Open a command window with elevated privileges (Start -> Right-click
“Command Prompt”, select “Run as Administrator”)
2) In the command window, execute the following commands:
SET DEVMGR_SHOW_NONPRESENT_DEVICES=1
START DEVMGMT.MSC
The second command starts the Device Manager. It MUST be started from the
elevated-privilege command window for this procedure to work.
3) In Device Manager, click the VIEW menu item and select “Show hidden
devices”.