I can't let your comment stand.... SuperSarge pointed out a trick (if you read as far as Method 2) that saves a double install with an upgrade disk and upgrade key. The key with with an upgrade disk will only work with an upgrade disk and there is nothing gained by downloading an ISO that matches the key since you must have the upgrade disk if you have the key. I wouldn't call a single install with a simple registry hack the hard way. I would love to hear your short way to a clean install with an upgrade key and an upgrade disk without hacking the registry. By the way, which ISO would you propose to let one do a single install with an upgrade key?