You have to add devmgr_show_nonpresent_devices as a System variable in 2008.
right click Computer and choose properties then click Advanced System Settings.
Click the Environment Variables button.
Click New System Variable button (The bottom "new" button).
Variable name = devmgr_show_nonpresent_devices
Variable value = 1
Ok out of this and open device manager and enable hidden devices in the view menu.
Cheers
Paul