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When a device is installed it creates a GUID which is a unique code given out. When you install a new driver this goes in the registry and also the inf file is copied to the systems inf folder as a number.inf (like 13.inf or oem13.inf).
So to remove the driver first uninstall, then reboot.
Then look in your systems inf folder and open each one up in Notepad. If you find one that is the same as the new (nonfunctional) driver, then delete it outright. Windows may complain it is a system file, but who cares, because you have the original anyways.
Then try to reinstall.
If that doesnt work, then the easiest way (but would leave a messy trail of drivers in your system) is to open the old (functional) inf file and change the: "DriverVer = 08/29/2007, 1.0.0.0" where it would be "mm/dd/yyyy, v.v.v.v" where v is a version number. If either the v.v.v.v or the date is higher/newer than the old oem file, it should say it is a new driver and overwrite the old one.
So change it to like v.v.v.(v+1)
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