This is more of a how-to than anything as I have been struggling to get some win2000 software running in any of the Virtual systems that win7pro would allow, but finally I have it all going.
I already had the win2000 .VHD from a previous computer that died.
I tried to use the Windows Virtual PC (different to VirtualPC 2007) provided with win7pro but it only supported guest OS back as far as XP.
I could create a new .VHD and install win2000 on it, but then I could not access the host drives etc.
OK, time to sratch Windows Virtual PC - so much for progress.
I downloaded and installed the 64-bit version of VirtualPC 2007 but when I ran it, I got a "Blocked b/s" message, thanks MSoft.
Thinking about it I first went to the BIOS (UEFI in this case) and disabled CPU Virtualization reasoning that when VPC-2007 software was written there was no such thing within the CPU.
Back to the pre-exisiting .VHD, I deleted the Saved State file .VSV.
I then went to the VPC-2007 installation folder and renamed the "VirtualPC 2007.exe" to "wobbly.exe" and ran it and lo and behold, up comes the familiar old VPC-2007. It seems the "Blocked" message was based soley on the launch name of VPC-2007.
I had to reinstall the VPC-2007 Virtual Machine Additions but when it was finished, the Shared Folders that had been assigned on the previous PC were all still assigned and active.
The win2000 within booted fine and is running as I type this.