Had some problems with my previous card, Nvidia 9500GT, and changed it to Radeon HD 5770. Took me two nights, before finally gave up on the new 11.5/11.5a drivers. "Direct3D functionality not available", no matter what I tried. The 10.5 drivers that came with the card started working, allthough must "update drivers" through device magager every time the computer is started or rebooted. The Nvidia card did the same with the drivers, so I assume it is actually not the card or the drivers, but what might be causing this behaviour? Once the OS (XP Pro SP3) is up and running, I can go to device manager, and "update drivers" for the card with yellow exlamation mark, and both cards will start working, but at start-up, they just do not want to participate. Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111) Motherboard: Asus P5E64 WS PRO BIOS: BIOS Date: 11/28/07 17:35:36 Ver: 08.00.12 Processor: Intel(R) Core(TM)2 Duo CPU E6750 @ 2.66GHz (2 CPUs) Memory: 2814MB RAM (2 x 2GB) DirectX Version: DirectX 9.0c (4.09.0000.0904) PSU: 500W (brand new) Anyone have any ideas?