jakebache , i think the problem lies in that your computer registry does not have the ADFU string, which causes the failed installation.
Try going to your Windows Registry to add the ADFU into it.
Click Start >> Run
Type regedit
Click Ok
Now in the Registry Editor, browse to the following directory:
HKEY_LOCAL_MACHINE >> SYSTEM >> CurrentControlSet >> Control >> Class
Right click on Class and select New >> Key
You will notice that a new folder would be created with default filename like New Key #1
Change the "New Key #1" to {1181f4a0-f284-11d2-9068-00609797ea5a}
Be sure to include the 2 brackets as above.
Once done, you can close Registry Editor, and try updating the driver again using either of both files i've uploaded:
http://www.savefile.com/files/1207727
http://www.savefile.com/files/1205168