Asking this question makes me feel stupid, but I am OK with that.
So on the Windows Virtual - PC Support: FAQ page, I found the following:
Can I use Windows Virtual PC to run Windows Vista, Windows 7, or Windows XP in a virtual machine?
Yes. Windows Virtual PC can run properly-licensed versions of these operating systems in a virtual environment. For requirement details, go to http://www.Microsoft.com/Windows/virtual-pc/support/requirements.aspx./virtual-pc/support/requirements.aspx.
Cool. I already use Windows XP Mode to run programs and applications that I either don't won't (iTunes for iPad activation) on my Windows 7 64 bit machine or can't use (like Cisco VPN client), but I also have a spare copy of Windows Vista lying around and would like to run it virtually as well.
My question is: how? When I installed Windows XP Mode and Windows Virtual PC, the following was added to my start menu (under 'All Programs'):
Windows Virtual PC [Folder Icon] Windows Virtual PC [Icon With blue rectangle and smaller orange rectangle off-centered to the bottom right] Windows XP Mode [Same icon as above]
When I click on the Windows Virtual PC icon, it opens up a Windows explorer window with the following address:
The only files in that directory are a desktop.ini file and:
Windows XP Mode.vmcx
When I click on the Windows XP Mode, as expected, a virtual instance of Windows XP is initialized.
So, again, how am I to create a virtual instance of Windows Vista?
Further information: after digging around my program files, I found:
C:\Program Files (x86)\Windows Virtual PC
But all that I could find in that folder was another folder titled 'Integration Components', which contained the following .iso files: