I recently upgraded to a 64 bit computer from a 32 bit. I have used masm32 for x86 assembly previously. My computer can run 32 bit processes, but I would prefer to use all of my computers capability and write x64 assembly programs. I do not want to have to install extra things (like ide's) to make an assembler run. What assembler should I use?
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Is MASM for x64 what you're looking for?
If you want to avoid a Visual Studio installation, there's YASM, NASM, and FASM.
All of the above are mentioned in Intel's Introduction to x64 Assembly.

Kevin Richardson
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I believe I have to install visual studio to use masm – user2097804 Feb 28 '13 at 20:58
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There's a standalone MASM32 package (AFAIK, unofficial, collected from the various SDKs and DDKS piece by piece). – Alexey Frunze Feb 28 '13 at 21:03
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Edited answer to include non-VS options. However, as mentioned by Alexey, MASM does exist in standalone form. – Kevin Richardson Feb 28 '13 at 21:11
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@Alexey Frunze MASM32 not 64. – user2097804 Mar 01 '13 at 01:08