So a few months back, I lost the ability to watch any videos in Full screen mode from a webpage, and now I can't even watch the videos anymore starting last night. I get either a blackscreen with a few colored lines scrambled about or nothing at all, even the play/stop icons have disappeared though I can still interact with them. I still get audio with no problems I just seem to have lost all picture. Any suggestions?

I already updated Flash Player and Divx. I'm also working on Windows XP if that might have something to do with it.