As for the Warez software, I leave that up to your own conscience but strictly speaking it would be illegal to use that software. If your computer has a Windows XP, Windows Vista Business or Ultimate or Windows 7 Professional or Ultimate Certificate Of Authenticity label on it) then you can legally run XP (but only on that computer). If you have a licence to run Windows XP on your computer (e.g. However, it is very prevalent on the internet and the ISO file can be easily downloaded. Hiren's Boot CD is a heavily modified and illegal version of Microsoft Windows XP and contains some software which is not copyright free or distribution-right free (considered ).