This has happened to me for a few months, and I can never figure out why. It seems every so often while I'm using my computer, things will stop working correctly. I can still watch videos, but if I try to re-size the media player window, it doesn't do anything. At the same time, if I load up something java based like google maps. I cant drag the map around to change the view. Also when this happens my screen saver usually wont turn on either. When I look in the windows task manager and a process viewer, I do not see any odd programs running. What could cause this and how do I fix it other than re-starting?