Just an FYI, Windows XP Mode requires an additional 1 GB of RAM, an additional 15 GB of available hard disk space, and a processor capable of hardware virtualization with Intel VT or AMD-V turned on. You will also need to download Virtual PC.
Additionally, Microsoft does have an official Windows 7 Support Forum specifically for IT Pros located here http://social.technet.microsoft.com/Forums/en/category/w7itpro/ . 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.
Have you already tried to run it on DosBOX? I've tried here, and it's very fast, you won't have problems with FPS. But i don't think you'll be able to run it native.