Forgot to say something. On one install I had to change the key, on another machine, the registry key didn't needed to be changed. Carlos

Here it goes http://www.winsupersite.com/win7/clean\_install\_upgrade\_media.asp Carlos

You can do a clean install with an upgrade disk. Just install it without the windows key, then before activating you have to change a registry key for windows to accept an upgrade key. Carlos