On Kashyyyk my computer crashes

[KotSte]

Hello there,

at first my system:

MoBo: GA-7S748-L
CPU: Athlon XP 3000+
RAM: 1024 MB PC3200 Corsair (2x 512 MB ValueSelect)
Video: MSI-NX6800-LE
Sound: CL Audigy LS

Windows XP Pro

Everything is fine playing SW BF. I can see the sky also. But when I run the first campaing and fighting on Kashyyyk my system crashes. Sound freezes and monitor goes to black/off. There is no signal it says...

Can anyone help or has the same problem, perhaps on a other map? Pls, let me know what to do to solve.

So long, Steffen