Have you ensured that you have the latest drivers installed for your audio device and that they are certified to work with Windows 7?
Also, Microsoft does have an official Windows 7 Support Forum located here http://social.technet.microsoft.com/Forums/en-US/category/w7itpro/
. It is supported by product specialists as well as engineers and support teams. You may want to also check the threads there for additional assistance and guidance.
Microsoft Windows Client Team