I got this laptop a couple years ago, cost 450 and has a celeron..it's fine for what I need BUT I often get this crazy problem where my pointer opens up things when I just pass over the link, my caps function stops working, I get < instead of period, and worst of all, I get out of control highlighting. Just, everything highlighted so I can't delete or write or anything. I just have to shut it down. What would cause a problem like that? Could it be overheating?