Every time I watch a DVD on my computer, the screensaver kicks in after 30 minutes or so. I have to shake the mouse to make the movie come back. It's a pretty annoying pattern. I've tried setting the screensaver to come on after 50 or 60 minutes, but it doesn't work. Its threshold appears to be approximately 30 minutes. What bugs me is that the pc regards the DVD as an idle process, so it slips into screensaver. Is there a way around this?