Shaders missing on my WindowsXP & ATI

[Richard]

I read up on the X1300 a bit and although it's a somewhat recent card

Indeed; it's one of those being inside DELL's new (=2007) Vostro. With 256 MB V-RAM I thought I'd be OK, but you're right, it's just :

it looks like it's a low-midrange model.

Unfortunately.

Make sure you turn off Anti-aliasing and maybe try a lower resolution. Other than that, the only other option is to turn off shadows -- see if that keeps the cars shiny (so, the no-shadow shaders compile fine),

Disabling Anti-aliasing and shadows improved a lot: jumps from ~10-12 fps to 25-35 fps, with the cars all shiny. So I can play the game again.
All the other settings I kept to maxium, because lowering the option values didn't bring a single frame increase.

Thanks again for your help.