Ok. I'm running on my acer ferrari 4000, and it has a x700 mobility radeon in it. I went to upgrade my drivers today, and it "crashes" my computer. What i mean by "crashes" is... i use the mobility modder, i dl the x64 6.4 catalyst version, i do the whole install, inf error, exit, run mobility modder, mod the recently dled/installed x64 6.4 cat driver. The driver installs, the CCC installs, i go to reboot the computer, and BAM!, right after the load screen where its like: Windows XP x64 Edition with the little blue bar that goes left to right left to right.. Right after that screen, the screen turns black, and nothing happens... I left it on for more than an hour just to see if it was just being "slow" nothing.... i tried lots things i've read around on forums including: Driver cleaner: UNinstalled all the ati stuff, ran driver cleaner in safe mode etc... tried installing the driver again.. same thing Updated my .NET, this MIGHT be the problem... i currently have 2 .NET's installed... one is... microsoft .NET 1.1 framework, which is updated to service pack 1, then i also have.. microsoft .NET framework 2.0 (x64), which i need for microsoft visual studio. I tried the supershell, delete the "ATI Technologies" registry folder and reinstall drivers none of the above worked. All i want to do is upgrade my catalyst drivers to improve gaming. (just got oblivion) Previously, i had ATI catalyst 5.12 drivers on my machine working pretty well. But after trying to install 6.4 i lost it all, so i'm back with the original drivers that come standard with the Acer, from the acer site. Theres no version they're just called like the "acer version of the drivers" Thanks for your help!