When you say that you couldn't access Device Mnager, does this mean it didn't open or that it was blank when you di open it?
if so set the startup type for Plug and Play to Automatic. To do this, follow this:
Click Start, click Run, type services.msc, and then click OK.
Double-click Plug and Play.
If you receive a Configuration Manager message, click OK.
In the Startup Type list, click Automatic, and then click OK.
Restart the computer.
Stuff should now show up in Device Manager.
...cos we\'re travelling...at the speed of thought...UltraMagnetics