Here's some things to help you out...
Is the video card part of the motherboard (on-board video), or did you purchase a video card for the computer?
From what you've told us, the video card that you're using just isn't up to what is needed for what you want to do.
Now, you may be wondering, what on earth does that have to do with anything if I'm developing for the Zune.
That is a very good question, and I'm sure better answered by what I consider greatly more knowledgable people like Z-Man or Mykre.
So, let's recap. You need a better video card, or updated drivers or both?
BoomerET
Sports don't build character, they reveal it.
Inspire by Example.