remove damaged xp without disc

[Extreme Gamer]

Hi guys.I just got my new gaming PC a few months back.i used xp in it until now,for a few months,i have been a vista user.i removed some important registries by accident.now,this xp is pirated,vista is original.i wanna remove xp but i dont have the disc,and i tried cmd,but no result.the installation info is also missing due to a virus that i managed to remove.i have switched completely to vista(xp was temporary).please give me some suggestions

[ayush_chh]

what do you want to remove actaully?

if you want to remove XP (which is installed in your system as 2nd OS) you don't need any disk. just format the partition in which you have XP installed and with some repair in boot.ini its done.

[Extreme Gamer]

did that.wont do.i di manual delete and removed xp from registry,but some persistent files from adobe stayed back.all adobe programs i have are uninstalled

thanks for help.i managed to do it by changing owner of the files