When I boot up and initially log on to a user then switch to another (doesn't matter which order), the computer works okay. When I go back to original user, screen resolution jumps from 1024 x 768 to 640 x 480 pixels and I can't reset back to its original setting. When I try to go back to 1024 x 768 and hit apply, it stays at 640 x 480. Only rebooting will get it back. Does anyone know what I can do to fix this? This has been happening for quite a while now and is really bugging me, because I basically can't switch users!