Those Intel GMA video chipsets. The solution (?) was either getting the latest Intel driver (you didn't reveal laptop make, model or what driver you use) or dropping the video acceleration in vista.
Read http://docs.info.apple.com/article.html?artnum=305392 for an example of doing this for iTunes.
http://hyperpics.blogs.com/photos/uncategorized/wmp_optionsperformance.png is another control panel for this. Sorry, I don't know where all of them are.
Whenever I click on "fullscreen" button of any video site like youtube or voeh, the screen goes blank the sound continues but screen doesn display anything. I have Windows vista laptop. This problem is in both IE and firefox.
Can anybody please help me?????????????