Need help ;x

Hello,

After I quit ET for 6 months, I got a new pc with win7.
The problem is now, pb wont allow me to play.
Every time I turn ET on, and I try to turn PB on, my window just turns gray (I still can hear sounds but I can't see anything).
I tried reinstalling, gave administrator right, tried with windows xp service pack2, vista, etc...
Now I tried to search for PnkbstrA and B, but it seemed not to find it.
Is this causing this major problem or not?
All help is welcome.

Thanks.

PS: u can add me on xfire: xdftw, ty.