i just bought a laptop from a family friend. The default system files are in a folder named after the previous owner. in this case the account was named Ace. its bothering me and i want to basically make it like nobody else has ever owned/used it. so unless anyone knows how i can fix that, i need to reinstall windows xp and set it up myself. my question is, can i use the registration number that whoever had this comp before used? am i going to have to buy a new copy of xp?