Direct3D does not display models correctly

Hi,
At the moment when I play games on my XFX Geforce 6800 GS graphics card I get things like this happening:
http://img91.imageshack.us/my.php?image=testchmba030003lz3.jpg
http://img521.imageshack.us/img521/3746/artifactsyx6.th.jpg

I have tried my card in these set ups:
Windows XP on other machine - works fine.
Windows XP on my machine - works fine.
Windows Vista on different computer - works fine.
Windows Vista on my machine  doesnt work fine.

I went over to XFX support ticket system and they suggested that I try setting the PC-BIOS to `optimal` or `setup`. Disable side-band addressing and fast-writes (which was not available), set the AGP aperture size to 128 and set AGP to 4x to help with stability. All of which didnt help.

A break through happened when I was using FXComposer 2 (http://developer.nvidia.com/object/fx_composer_home.html). In the program I was able to load in a teapot model and switch between OpenGL mode and Direc3D mode. While on the Direct3D mode I found I was getting the usual graphical glitches, as you can see from this image:
http://img225.imageshack.us/img225/7752/directxoq8.png
When I switched over to the OpenGL tab the teapot had no graphic glitches what so ever:
http://img164.imageshack.us/img164/4350/openglcl1.png
 I checked the DxDiag and it reported no problems .

Since Tom Clancys Rainbow Six Vegas and all source games use DirectX I tried to find games that I could switch between OpenGL and Direct3D. I remembered in CS 1.6 you could switch between Direct3D and OpenGL, so when I ran it using Direct3D although no visual glitches could be seen the FPS was down to 30FPS. When I switched over to OpenGL it went up to 60 FPS.

When I told XFX via the support system they said this would be a software issue and that I should probably best to contact software vendors. I am currently clueless what I should do next so I thought I would ask you lot if you knew of anything that I could do that would fix this?

I have reinstalled windows vista and recently just updated to Windows Vista SP1 and tried these drivers
    * 10051-vista-x86-32bit-[Guru3D.com]
    * 158.18_forceware_winvista_32bit_english_whql
    * 163.75_forceware_winvista_32bit_international_beta
    * 163.75_forceware_winvista_32bit_international_whql
Currently I am using 175.16_geforce_winvista_32bit_international_whql which didnt solve the problem.

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