My Windows XP freezes at various stages of start up, it runs in safe mode but won't system restore. The computer was bought legite but has now ran out of guarantee. My mate has a dodgy XP CD which he says will go over the top of my original, I have so far refused but I can't use my PC unless I allow him to install the dodgy version, and I will lose my info on the original version if he formats the hard drive which he says is the best option. HELP ME PLEASE !!!!!