Periodically, it may be too late to simply update your driver, and you may need to roll back to a previous version of the driver that used to work for you. A simple way to do this is to use the Roll Back Driver utility found in Windows XP and Vista.
To access this feature, navigate to the Device Manager, choose the device with the incompatible driver and select 'Properties'. Next, on the 'Driver' tab at the top of the dialog box, select 'Roll Back Driver'. This procedure should take your system back to the working state it was in, before you installed the incompatible driver.
When you're deep down in the system plumbing like this, it's critical to use the System Restore function baked into Windows to cover yourself in the event that something goes wrong during the update and repair process. You should make a practice of establishing a System Restore checkpoint every time you attempt to update a driver, install a new application or connect a new device. This step can save your bacon if you start experiencing bizarre, hard-to-identify issues after updating your drivers or programs.
Best of luck with troubleshooting incompatible driver problems!
Note: We always recommend users skip the hassles of trying to find their own hardware model numbers and use an automatic driver update tool like Driver Wizard.