Device Manager (Windows 7, Server 2008, etc.) hides devices that are not plugged in, even if you click on View / Show hidden devices. To reveal them, do the following:

(1) Start a command window with elevated (administrator) privileges. Start, and in the search box type cmd – without pressing enter, right-click on cmd in the Programs section and click “Run as administrator”.

(2) Type the following into the command window:

SET DEVMGR_SHOW_NONPRESENT_DEVICES=1 
START DEVMGMT.MSC

(3) Click on View / Show hidden devices in Device Manager.

The revealed devices can, with care, be deleted to remove the associated driver.