I had that problem once in a while too, I started getting it when I got the 2000 drivers for my V3, and when I got the new windows update stuff. What I did was on the "RUN" thing on the start up bar, I set it to run unreal, so when that happened I pressed the windows key, went up twice and hit enter, then unreal would start. When I went back to windows it was back to normal, this only worked once, cause since then I formatted and haven't really seen many avis or MPGs, if you have any games, wouldn't hurt to try, worst thing that can happen is it won't work.