Windows Virtual PC - Discarding Changes On Exit (Win7 Host)

I need Virtual PC (VPC) for testing my Visual Studio 2008/2010 applications, and I want to test and debug it using VPC running a clean install of WinXP (nothing else installed).

Back when I was running WinXP, I could launch a VPC session, do whatever开发者_C百科 I needed to (install my application, run it, debug scenarios, etc.), then exit without saving any of the changes to my virtual machine's hard drive.

There does not seem to be this option under Windows 7 - or, if there is, I have been unsuccessful in activating it.

Is there a way to make sure changes to my virtual machine are not saved?

Regards, ~Joe

This functionality is enabled by using 'undo disk(s)'. Check out this blog entry for info.