If you have the exact same problem, you ought to know!
![Smiley :)](http://forum.nasm.us/Smileys/default/smiley.gif)
Seriously, guys, we need more information. What did you do? What did you expect to happen? What happened instead?
If this is "the 16-bit problem", even I can't blame Microsoft for it. When we put the CPU in "long mode" (64-bit), "v86 mode" (which is what WinDOS has been running in for ages) is no longer available. Blame AMD, I guess, or perhaps the laws of physics. AFAIK, 32-bit programs should run in 64-bit Windows. That would include Nasm itself - I don't think we provide a 64-bit build of Nasm. There may be issues I'm not aware of. Tell us about it!
You should find 64-bit examples in the "Example Code" section (mostly thanks to Encryptor256 - Thanks!).
As "Number Five Is Alive" says... "need input", "need input"...
Best,
Frank