For most 32-bit software, it "just works" in 64-bit. In other words, just
install it in Win7 x64 the same way you would in Win7 x86 (or in Vista or
Some will need to be run in "Compatibility Mode" and will need to be set as
compatible with WinXP or Vista, but this usually is not related to the
"bitness" of the software.
In almost all cases, though, 32-bit software runs as well - or better - on
64-bit Windows as on 32-bit Windows. ;<)