Contact Microsoft with a valid proof of purchase for Win7 Ultimate, they might (not sure on their policy) make available a key for you to download.
Otherwise, make another Win7 serial thread here and receive some more sarcastic answers. There are literally hundreds of people that ask for free keys here and none of them get it, most of the time we don't even bother to be serious about answering the question.
hotstuff 101 said:
Well then , you should not offer a free keygen and then try to make others look stoooopid!
No one made you look stoooopid. You did that all by yourself.