For some reason mp accesses my drive every 3-5 seconds, which make the video playback choppy. It never did this before. I have an AMD 1ghz with 256mb ram. It doesn't matter how small the video is. It does it with every kind of video. Some other programs do it too, and some don't. It seemed to have happened when I installed a bunch of codec packs. I uninstalled them all and the problem is still there. However now I have a new problem...sometimes I cant get any sound from mpegs. I installed divx, xvid, and ace mega codec pack. I tried changing every video/sound option available, including hardware acceleration, but nothing helped.