I want to sell my Dell Inspiron 5150, and am trying to restore it to factory settings. The problem is though that sometimes (not all) on startup I get a black screen saying Boot Driver 0 Not Found. If the computer starts, its fine. Sometimes I also get a blue screen of death on shutdown (cant remember what it says now). So how can I fix these problems to sell the laptop? Also, can't figure out how to restore factory settings, I don't have a disk?