Running Windows XP inside Vista with Virtual PC

[colinbate]

I saw this article about running Windows XP inside Vista with Virtual XP.

As it says, I've taken the leap into Windows Vista, but once in awhile, my heart yearns for the classic features and functionality of XP. Some of my software doesn't work in Vista, and I also design websites so seeing how they looks in Internet Explorer 6 is also an advantage. I currently dual-boot XP and Vista, but switching between the two takes too much time, so this article was right up my street.

However, the article guides you though a fresh install of XP which I don't want to do if I don't have to.

What I want to know is, is there anyway I can use my current installation of Windows XP including all the installed software I have and put that on a Virtual PC?