Full screen problem

[parmafan]

Video resizing to fit full screen doesn't work good. There are really distinguishing squares in full screen. This is the case on WinXP, but on Win98, there is no problem. Then I disabled 'Overlay mode 1' in rendering options, and it works. But my friend has it enabled and it works for him too.
Has anybody had these kind of problems, or know why this is happening?

my system spec: riva tnt2, dx9, bsplay 1.02, winxp(currently)

cozdra
parma fan SF

[parmafan]

something i missed in previous post:
drivers: detonator from 28.xx to latest work the same way, and i have set all options to best quality for the graph. card

cozdra
parma fan SF