TechNet subscription purchased. The best deal I could find was 25% so it was about $277 after tax.
I'm downloading Windows 7 Ultimate x64 right now. There are a LOT of versions to choose from. Starter, Basic, Ultimate, Professional, Home Premium, and Enterprise, and most have both an x86 and an x64 version PLUS most of them have "N" versions, whatever the hell that is.
I was trying to figure out if I had MSDNAA, but finally I figured screw it and went ahead and bought TechNet.
BTW, Chief, what kind of MacBook do you have? Pro? What are the specs? Command - Space, type "sys" and it should be on System Profiler and you can hit enter to open it.