Cannot run FreeBSD 6.0-R in Mac Virtual PC 7

[wrangled]

I have not been able to get any version of FreeBSD (5.x or 6.x), PC-BSD, 
or DesktopBSD to run inside Virtual PC 7 on my Mac Mini.  The installs 
hang on the message:

     Extracting base into / directory
                        2%

Supposedly FreeBSD did run in older versions of Virtual PC (I guess 
before Microsoft bought Connectix).

Inside the VM, I tried selecting the types "UNIX", "Linux", and 
"Unspecified".  None work.  I wonder which "UNIX" does work.

Any suggestions?