ATIHD 2600 pro, not another driver problem...

Not long had this card , i downloaded some drivers of i site which where referred 2 as agp ati hd 2600 512mb vista 64 drivers.
They turned out 2 be msi drivers for the same card mine is the sapphire version of the card , all seemed fine and dandy at first.
I was playing bioshock on full settings with playable good fps a vista score of 5.6 for aero and 5.2 for gaming etc.

Anyway after a good few hours of gaming i booted down for a few hours but when i booted back up again later that day my games started freezing up on me all the time.
I could game for about 10 mins if i was lucky b4 everything freezes i could not shut down my pc properly it would just not respond.
I then went to the sapphire site and downloaded the latest 8.5 agp hotfix i uninstalled the msi drivers and used drivercleaner etc and although they seemed to install they did not work at all. Vista still had me down as a generic vga driver and there was no cat center to be found ?
I also tried the non agp hotfix drivers with the same results.
I just installed the driver that came with the card and they have installed and seem ok so far, the only problem is now that when i play games like bioshock the frame rates have dropped down to almost unplayable fps which sucks, now i have 2 lower the settings quite abit and my vista score is now 5.5 for aero and 5.0 for gaming.

Im guessing this is because im using older drivers ? Does any1 know were i can get agp 8.5 drivers that will install ?
Ati or more so sapphire as they make the agp cards still need 2 get there act together if there going 2 sell these agp cards still then they should make sure they function properly by supplying drivers that work.

Here is your link to find drivers for your card. The first post has it : DNA 8.5 VISTA (AGP hotfix version) BETA's - DriverHeaven.net

cheers.