My laptop is a Compaq Presario 2500 that runs Windows XP SP1 Home Edition. One night when I turned my laptop on, it wouldn't load the user accounts that are on the laptop. The laptop freezes when I click on one of the names. Sometimes it restarts. So I was trying to remember on how to boot on Safe Mode, I pressed F12 instead of F8 and the laptop said the OS was not found. What are possible solutions to this?