I have W7P-64bit, and haven't had a lot of problems running most 32-bit
programs. The one exception was trying to load AutoCAD 2000 - the 32-bit
installation program would not run... Which is why I upgraded to AutoCAD
LT 2009, and even then I had some some issues with trying to install
some of the service packs for it - W7P-64 would not run them. Recently
upgraded to AutoCAD LT 2012 and haven't had any problems. Not really
sure if it installed as a 32-bit or 64-bit app, but I'm thinking it was
64-bit.
IMO, unless you're working on some large & complicated stuff, the
difference between 32 & 64 shouldn't be noticeable..
Martin