Make sure you apply this fix before your VS2010 CTP VPC expires! (Lisa Feigenbaum)
Have you downloaded and started using the Visual Studio 2010 Community Technology Preview (“CTP”)? If so, you may have noticed that the Virtual PC it runs on, will expire at the end of the year. See the following blog posts from Brian Keller and Jeff Beehler, on how to turn off the synchronization between the Virtual PC and the host OS, and fix this problem!
Visual Studio 2010 CTP VPC: Dealing with Activation Messages
Dealing with the Team System 2010 CTP expiration