You can also copy your Win 7 PC into a Virtual Machine and run it on any operating system. That goes for any O/S before or after Win 7 too. The conversion software is free, and the VM player is free.
I had an older computer we had to do that with. It had some programs I cannot get anymore, and data on there. Kind of weird seeing that old computer interface. Nice to have, though I rarely need it. (twice in three years)