Hello,

Thanks for the answer,
Yes, Unchecking "Use High Quality Mode" for "Use Overlays" fixes the problem.

But, when uncheking HQ mode, vidéos are no smoother anymore, especially for
"Low resolution" ones in full screen display.
Using HQ mode always gave me very beautiful image.
So, I don't really want to uncheck it (maybe if I find an Image enhancer).

I cant really tell that it's a problem from my GC drivers, cuz before
patching my system with the KB911565, all worked fine (even after, all WMVs
still working really fine).
removing the KB911565 resolves the problem, but make my computer "hackable".

I asked people around me, and they all use "Overlays", cuz they told me thay
had problems with the "use HQ Mode" (not the same as mine).

So, I think that's the KB911565 fault, cuz it changed the way "images" are
proceeded by the WMP, and that (maybe) interfere with the other codes, but
not with the WMV codec.
Not sure, but maybe this is the problem.

Right now, I'm uncheking the "Use HQ Mode" for Overlays, but I'm not
stisfyed, the image is really poor in full screen, and my Hardware is
especially capable for multimedia (Dual Core Opteron, 7800GTX, 2GB of HQ RAM
... etc).

Maybe someone will give another solution, thanks ^^ .