green squares

Whenever I boot my PC a bunch of green squares pop up for the whole startup process then after the windows logo a screen shows with lines that look like the matrix and after a couple of seconds a blue screen appears and just starts the process all over again. Might be an error within my video...

Hello, I am using Windows Vista Home Premium and I was wondering if you guys could please help me out. Whenever I watch a film, it seems as though I am able to watch about half of it before the problem occurs, but then it appears and will not go away until Windows Media Centre is closed and...