Actually you can dissasemble and do all of those things as long as you don't release it.. or reproduce it in some other form..

and I don't urge you to dive into the Turbo Assembler because it'll drive you nuts just trying to understand what you're looking at not to mention how to use it

stick with MASM ~_^ very easy
http://www.movsd.com/download/masm32v7.zip

edit: Whoops! My bad Krez! I didn't see that above message but yah... still