I tried the same with my laptop (its 32bit vista) and it has a Nvidia Geforce 8400M and its the same.

TriNitroToluene, thanks, i tried that you said, file, preferences,video out, and if i select "directX base" it works! But why do i have to use that one? Isn't it compatible with DX9? I tried Dx8, Dx9 and DX9a and it is not working fine, only with the "base" one. Will it be slower if i use the base directX?
Do you know why is this happening? Thanks.