Why not use the sysprep tool built in? Also now available is MDT 2010 (Microsoft Deployment Tool) which will help you create images and automate the OS and application installations, data migration, and desktop configuration process. To learn more, please go here: http://bit.ly/GZnEY
Should you require additional assistance and guidance, Microsoft does have an official Windows 7 Support Forum specifically for IT Pros located here http://tinyurl.com/7jq7ps
. It is supported by product specialists as well as engineers and support teams. You may want to also check the threads available there for additional assistance and feedback.
Microsoft Windows Client Team