This is somewhat of a weird question, but let me explain.
I used to run Virtual PC 2007 to try out various operating systems, etc. I really liked two things - one, the ability to roll back any changes that I made tinkering with the operating system. And, two, I liked the fact that the OS was "sandboxed" so that if I really did something dumb, I would be protected from the problems affecting my main OS.
So, while I know Windows Virtual PC is a bit different, does it still offer this sort of protection (the second item above)? If I run something in Windows XP mode, will my host OS be protected against any problems that may happen?