I found myself doing this, and I had all kinds of creepy-crawlies in the back of my mind.
It's a VirtualPC instance of Windows XP, and I'm installing VMWare Infrastructure Client so I can connect to VMWare ESX, to test out VirtualCenter's features, etc... it just feels soooo wrong. I need to buy a copy of VMWare Workstation so I can get rid of this dirty feeling that I have.
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.