Hey Yall. My Windows xp Home Edition CD-key is already registered. (I used it before my hard drive broke). So I went out to buy another copy I can use but I couldn't install it because I needed a previous version of windows to install it. So I took it back. I wanted to install Windows XP anyway so when I do get a code I won't have to install everything again. But I don't want to spend 200 dollars on it. If I go back and get the upgrade version of it do you guys think that that CD-Key will work?