I've got the need to install 64 bit version of AutoCAD. I could go with XP, but I want to bite the Win7 bullet. If I go that route, my main concern is all the 32 bit applications I already have, not to mention drivers... though I don't have much other than stock hardware and what you see in my sig. How do 32 bit apps generally run in Win7? I've got MS office 2007, Paint Shop Pro, and of course a bunch of games. What sort of headaches am I looking at?