See the FAQ (my keys still work) on how to download MASM, NASM or A86 (I don't know if all three are there).
If you have a linux computer near you you can also try assembly there, See this link on how to do assembler in linux. The good part is that both assembler and linker are already available. The bad part is that the syntax is different from most other assemblers.
All the buzzt CornedBee
"Writing specifications is like writing a novel. Writing code is like writing poetry."
- Anonymous, published by Raymond Chen
Don't PM me with your problems, I scan most of the forums daily. If you do PM me, I will not answer your question.