My computer has been acting weird off and on for a while now. It usually lasts for maybe an hour, then stops, and starts again later. In both IE and Firefox, if I have more than one tab open, it will automatically close the tab I click and bring me back to the first one. When I try to left click in Firefox, it brings up the scroll thing. I can't double-click desktop icons, and I can't open bookmarks, history, or anything. My computer has Vista, if that helps. Any advice?