Last night the new windows 7 Validation went live, it updates your computer and is a browser validation tool, Many people are having issues with Validation, it can tell you a legit windows 7 is non-genuine ( kiss of death) and tell you to buy a new key if its an OEM windows 7.
It happened to me but I was able to recover it and get it validate, it took some code work more then the average person would know to do.
Also there is a MGA diagnostic tool thats new and windows 7 users who have not installed this new update for validation should not use this tool because it too renders the software non genuine.
Since we are not a Windows 7 site and I'm a VIP on a WIndows 7 site I will ask you to post your problems there: http://thewindows7site.com/forum/index.php
I and others will answer your questions