Most computers that come with Windows 7, seem to come with 64-bit Windows 7. The 32-bit version of Windows 7 may work with older programs and hardware, but the 64-bit version has given me fits on a number of things.
Still, I generally am happier with Win 7 than I am with the XP computers I'm trying to keep alive. I've generally been able to come up with workarounds that have kept me from having to buy new stuff - but I did have to replace my scanner.

-Joe-