sony vaio laptop?

hi my sony vaio vgn nr32m laptop does not work, i bought it of someone and im beginning to think that it could be stolen. it was working fine but suddenly it just would not let me even boot up so i wiped all the origanal stuff of which was vista home addition. then i installed windows xp ultimate and now every time i turn it on it gets to the loading page where it says windows xp loading then turns off and comes on again continueasly

scott
January 2009