I just upgraded my PC yesterday and something very odd is happening. After installing the Catalyst drivers for my X1950 pro (that work very well in the old setup) my system become extreme slow. Even the mouse pointer!! It is simply impossible to open a web browser for example. But after uninstall the video drivers the system returns to function normally.
That´s my old setup:
1gb (512x2 Kingston Value)
Radeon X1950 pro
Athlon 3800+ Venice
And that is my new setup
Pcchips A33g (I know, you don´t need to say anything about this )
2gb (1gbx2 Infineon)
Radeon X1950 pro (same as above)
Athlon X2 4000+
I have this same motherboard and the exact same problem. I've tried three different video cards just to make sure it wasn't a video card problem - all with vista compatible drivers. I've done all the latest updates for every piece of hardware and made sure vista was updated with all the latest updates. Nothing fixes the issue.
I can run vista with the "standard vga driver" installed (no 3d acceleration of course = no aero or games). As soon as I install the correct driver, everything comes to a molasses slow down. I contacted PCCHIPS about it and first they blamed it on the video card, then they blamed it on Microsoft. It really makes no sense, the only out of the ordinary thing I can see is that when you enable the correct driver for the video card, it assigns it an IRQ of of some insanely high number... something like 690001f