GFX card prob/ screen prob

Hello sexy boys,

I've got a big problem.
I've installed windows 7 on my macbook, so i could use slac and shit.

Now, when i installed ET and i opened it, black/orange transparant stripes apear, like a barcode moving up the screen. They slightly move up.

Its not my screen cause i've tried playing et on it in Mac.
Its not a broken GFX card cause in mac she works fine.

Any solutions?

or just another vid_restart / format c / ctrl+alt+del problem?

thx anyway

Chick