How can I get xp back on my laptop?

I have a Advent 7096 laptop, it was given to me by my father in law as he has got a new one. When he got his new laptop he put the windows vista os onto this laptop (originally xp). Doing this has made the Advent really really slow as vista is taking all the memory up and I just dont think it can handle it. Can I just download a boot cd from a torrent? I have the laptops xp original product code. Any ideas?