To show non-present devices in Device Manager, do the following:

• Open a command prompt by typing cmd in a run box.
• At the command line, type the following: set devmgr_show_nonpresent_devices=1
• Hit enter, then type: devmgmt.msc
• Once Device Manager opens, click on View, then Show hidden devices

This is a great way to delete a corrupt driver that keeps re-installing itself. Just be careful not to delete something you need!