I was trying to run the Windows 7 Virtual PC, not Virtual PC 2007 SP1. I get an error message: 'VMMachineName' could not be started because there is not enough system resources or memory in your computer. You can shut down other virtual machines or close open applications and try again.
Task ending the wbvista.exe allows the virtual pc to work normally but unloading does not.
I have tried both WB7.01 and WB7.09c
Windows 7 x64 Professional with 5GB of RAM.