Apart from the hardware, I was using:
- Windows 7 Enterprise 64 bits (but not as a bootable VHD)
- VS 2010 Ultimate
- VSSDK 2010 Beta2
- DSL SDK 2010 Beta2
And everything used to work fine for me (I'm now using a later version)
The only problem we are aware of is an incompatibility with ASP.NET MVC post Beta2. Did you happen to install it?