[quote='Kang',index.php?page=Thread&postID=188844#p ost188844]I just built a new rig and attempted to install an hd 4850 x2. I'm using Windows Vista Home Premium SP 1 64 with a Core i7 920. The system recognizes the graphics card is installed, but disables the drivers at start up. I tried reinstalling the drivers with no luck. I also tried installing older versions of the drivers with no luck. If anyone using this graphics card has had similar install issues, how did you fix the problem? Any advice is greatly appreciated.[/quote]Did you try the usual: Uninstall drivers, reboot, let the system load up vga drivers, install latest 9.13 ATI catalyst drivers that you can download from the [url='http://ati.amd.com']ATI site[/url] ?

If you did this, tried with Drivercleaner?