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Bring up Device Manager. Easiest way is to rght-click My Computer, select Properties and then select Device Manager from the left hand pane.
When Device manager is running select View->Show Hidden Devices.
Now look at the non-plug and Play Drivers. The NULL device should show up there. If you right-click on it and select Properties does it say that the device is working properly?
If it is not then at least we will know what the problem area is.
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