I've been told that some games will run on W7-64 but they use old 16bit install programs that don't run. You may have to do searches on the exact game titles to find help.
If you have Win7 Pro then you can download and install a virtual XP from Microsoft that will install and run under Win7. We do this with some of the computers in our office.
As a last resort you could install XP on a separate partition and then just dual boot to whichever OS you want when you turn the computer on.