Can you install Windows 7 on Microsoft Virtual PC 2007, VirtualBox on a mac, or on Windows 7's Virtual PC?
Using Virtual PC 2007 to install Win 7 is a bit weird... but in fact, it is just like installing Win 7 on an old machine... so if 10 years later, if there is Windows 9, you can still install it on a Virtual PC 2007 probably?
Did anyone try those and saw how big the .vhd or .vmdk was? Win 7 requires 16GB of hard disk space so maybe the .vhd file is close to 16GB too? In that case it is hard to burn to a DVD-R and store that image file for later use.