This MS tool
may help you to decide.
Have not had much time to play with Win7 myself. When I have it has been only 32 bit. No tweaks no additional programs installed.
64 bit does seem to be the future. How fast the other software\program writers catch up is the question.
MS does offer basically an XP VM
= Virtual Machine to run non-compatible programs in. Do not know how well it works or if it is available in 64 bit either.
Edited by ThunderZ, 14 November 2009 - 11:03 PM.