I tried what everyone suggested, and ended up wiping the drive and starting again..
I created a pkg really quickly to put in all of the needed drivers from the WINDOsx86 release into a package that just updates the KEXT's..
Run it after you do your 10.5.5 combo update.. It won't backup or delete any files just overwrite and reboot..
Use Pacifist if you wish..
Link to Update Video / Sound / etc fix..
Hope it helps..