Error mw2..

I put vista on me pc and now I got error wiht mw2.

Error:


I just install Directx 10
Directx 11 can't is only for win7.
What I could do..

Reinstall/update?
I think you can use DX11 in Vista if your graphic-card supports it..

Ok thx i try it but i got a legal mw2 ..