* Right click on your My Computer icon.
* Choose "Properties" from the resulting drop-down context menu.
* Click on the "Hardware" tab,
* Click on the "Device Manager" button.
In the list of your installed hardware, are there any devices which have a yellow exclamation point or a red "X" next to their name/icon? If so, double-clicking on the problematic device will open a status window which will give you more details concerning the error.
Post those details here (fully and completely), as well as the exact name of the device in question.