You really need an xp disc matey to do a good job.
I wouldnt ever suggest downloading one from a torrent site with a key generator , no that would be illegal so dont do that
XP Pro SP2 Corporate Final Edition (download torrent) - TPB
.Anyway after you do you need to do a clean install , obviously save all your
porn data beforehand and copy it to disc or summat.
After the install you need to go onto your laptop manufacturers website and download all the necessary drivers for your laptop
Toshiba Support - Model Selector
Then it's away you go , although next time you get a bet in put some money aside and get a new laptop !
good luck