Like many, I have a lot of old programs. I have one that I have to have, but when I switch to WIN 7 that program CRASHED WIN 7 when I installed it. Obviously it is not compatible. But Windows 7 Virtual XP it can still be used. Just follow this LINK to get started in downloading it.
It will set up a virtual XP machine under Windows 7. It does let you use files from the WIN 7 space in WIN XP as well as USB Devices (I needed this for my scanner -> PDF software).
I stumbled upon this, but didn’t find to much posted on it (still trying to figure some of it out myself), but thought someone else might be looking for this solution so I thought I would post it here.