[Horses]

Dear,

thank you all for your quick reply.

I've tested it again and can now conform that it works in windowed mode smoothly (at 800x600, download version).
I prefer fullscreen mode, because it is much too small in windowed mode.
Fullscreen is still a problem-it runs very sluggish.
Maybe it is also a problem of the Nvdia drivers.

My Spec:
Vista Ultimate 32bit
AMD FX60
4 Gig DDR400
Nvidia 7600GS
Resolution 1280x1024