Well Still having problems with cod4 multi and win 7. So far all the pc's we put win 7 on are not capable of playing multi without getting kicked back to the menu. COD5 works great. I really do not want to reinstall vista as I will have to transfer the game profiles.
Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams. You may want to check the threads available there for additional assistance and feedback.