Is Windows 7 Ultimate still installed? If it is, then you could use the following to retreive it:
Here are four utilities, all of which will may display your product keys if they are still there:
Belarc Advisor: http://www.belarc.com/free_download.html
(It does a good job of providing a wealth of information.)
Also: http://www.magicaljellybean.com/keyfinder.shtml
and: http://www.nirsoft.net/utils/product_cd_key_viewer.html
and RockXP: http://www.majorgeeks.com/download4138.html which has additional features
If not:
Lost or misplaced product key (certificate of authenticity)
http://support.microsoft.com/kb/824433
How to obtain a replacement product key?
To replace a Microsoft product key, you must contact Microsoft Customer Service and Support. To locate the appropriate telephone number, visit the following Microsoft Web site:
http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS
To know more about this, visit
http://support.microsoft.com/kb/811224
