Virtual PC/Server won't launch domain controllor.

Hello People,

My physical computer and O.S. (XP Pro) are fine, and when I launch

several other virtual machines-no problem.

But when I try to launch a domain virtual controllor machine I get a

bunch of different errors, usually NTLDR is corrupt or can't find

\windows\system32\config\system or unkown disk

related errors.

Also get the same errors on a Vista box.

I've reinstalled several times, nothing in the BIOS changes anything,

I've run out of ideas, help.

Hans