Ok I bought an Os from a friend who said the old computer it was on crashed... I think he may still be using it. I own the CD and the key and another key that I am not currently using is this legal?
Are you using the key he is using? If you both are using I don't think it's legal, but if you're each using different keys but installed from same CD then it's no problem. If he's not using and you are it's also legal.