I have no problem running BIAB in 64 bit Win 7 BUT I have to use it in a restricted way

64 bit Win 7 takes up a lot more RAM than Win 98, Vista XP or other 32 bit operating systems. So 32 bit BIAB has less available RAM in 64 bit Win 7 than in a 32 bit Win version.

No big deal if you run a it with a midi synth or some realtracks.

However, if you want to take advantage of the VST and VSTi availability there are real memory limitations. Some of my VSTi libraries are large and I don't have the available RAM to use.

i HAVE 24 gb Ram and I can't use it with a 32 bit application.