I couldn't get it to work, but at least it didn't hose my system.
I'm getting tired of removing VirtualBox and then doing system restores just to make sure I got all the drivers and crap off. The only thing I tried that worked was installing into a VM directly from an XP install CD. But who wants to install apps for another week? Not me. I just took it off.
I suspect for it to work you need to make the image from a single partition bootable HD with the OS seeing itself as C:. Although it's never easy to be sure with this stuff since I have a fake Raid controller in this thing. The PC with the plain vanilla Sata only has 2 GB ram so it's not even worth messing with it on that system.