Replying to So should i reformat my computer orrrrr

Didn't know what forum to put this in so I just picked NSG...

Anyway, my rents just bought a new PC so i'm going to take the old one so i can use it to edit and other things. I obviously wanna get the optimum power out of it but will not be able to get that given its current condition. Its from '02 but has had some upgrades (currently 2gigs of ram) so it's not a total POS. I wanna reformat and just start fresh but don't have the windows XP disk and really don't wanna spend any money. What should i do to get rid of all the shit on it? Can i just steal XP haha... i really wanna start fresh on the thing...