You have to either buy Roots Magic, which is up to version 4.0 now, or go to the trouble of running a "Virtual" XP machine on Windows 7, and run FO 10 on the virtual machine.
I've got a $200 text editor that won't run on Windows 7, so I went through the hassle. It takes the virtual machine 2 - 5 minutes to boot up, and it doesn't do some things. As I recall, it took me a couple of hours to get it set up properly, and Microsoft Help didn't help much. I had to talk to a guy at HP to get it straight.
$29 is two bottles of wine when company comes over. I'd suggest you splurge on Roots Magic.