XP Pro
Athlon 64 3500+
Geforce 6800 GT 256 Mb
Ram 2 Go
SB Live!

Ok I got 27 fps

But here is all what I did to have 27 fps.

1) Installed Omega Forceware modified driver.
2) Installed DXTweaker to force Triple Buffering & V-Sync
3) Installed AMD Fusion Kit to shutdown all background services of Windows & give more power to AMD.

==> Now I can do some more like overclocking my system.
At least I will now make a new game trying the bugs I found on the road Lebec - Los Angeles. To see if there is any change.

Ok I still have the graphics bugs on the road Lebec - Los-Angeles.

==> only solution when I see 3D world missing : PAUSE Key