Not too sure if anyone can help me but........my laptop used to have windows vista home premium on it until my "idiot" of a brother did something and i now have windows xp on it. any suggestions on how i can remove xp and revert it back to vista??? thanks

First question would be: does your brother practice witchcraft?! lol Just kidding.

Okay, serious...

It is possible that your brother may have installed the Xp on a separate partition of the hard drive, and maybe Vista is still installed on the laptop.

If there is a recovery partition present, it may be as simple as a key press to restore Vista (backup anything you want to save first!)
Otherwise, you can probably contact the manufacturer of the laptop for a set of restore CD's. In most cases they're under $20 (US) and you'll receive them in a couple of days in the mail.