I have virtual PC on Vista Ultimate, on it I have Win98, WinXp Pro, Xandros (which is linux) & did have g-os installed which is basically Ubuntu under a Google brand. To answer your question could you be a little more precise as to your problem? All of these systems install the same way with different degrees of success, Xp being the best.
One disappointment to me in VPC is lack of usb support.
As a side note, G-OS from Google is rather amusing & is free to install on any pc.
xit