Or if your WinPE environment supports mapping a network drive, there are plenty of freeware screencapture tools out there you could use, then save the file to a USB drive (memory key or hard drive) or a network share. Again I haven't tried it myself, but I would think most of them would work (even Alt-PrintScreen then paste into some image editor). But, I also agree with Pikoshi or Brandon that capturing the screenshot from MS VPC would be the way to go. A lot of times I will use Snagit from my VM host machine and capture the screenshot inside the VM guest's console window.