This is paraphrased from a great article at Ars-Technica about installing a new motherboard without re-installing Windows, but it applies here...
From a command prompt start-->Run--> CMD
Type this text exactly as shown:
In Device Manager, enable "Show Hidden Devices" and have a look in the various trees. You may be surprised at how much stuff is faded or ghosted out.
GroovyMAME support forum on BYOAC