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I have a Windows 7 Professional DVD, but it doesn't specify whether it is 32-bit or 64-bit.

If it was a 32-bit DVD, can I use it to also install Windows on a 64-bit system, or do I need to get another copy of Windows which is 64-bit enabled?

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does the DVD say anything about x86, x64, ia64, etc? What does it say on it? – John Weldon Sep 23 '10 at 4:54
okies, got it its x64..I guess that is 64 bit. – kaibuki Sep 23 '10 at 5:47
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No, they are on separate DVD images.

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Amazon: Windows 7 Home Premium
Amazon: Windows 7 Professional

Both say "(includes 32 & 64-bit versions)".

Don't know if other answer is old editions, but those two copies seem to have both on one DVD. Which is my understanding of what comes on the DVD.

I also have a DVD for my work computer which specifies 32bit. Since it's a 32bit computer, they may have built a copy just for it (Dell included DVD).

Moral of the story: It probably depends on your DVD. I'm fairly certain that customer DVD's include both versions.

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The retail versions of Windows 7 come with two separate DVDs each with their own architecture on it. One for x86, one for x64. – Aeo Sep 23 '10 at 13:05
Ahh... I've yet to mess with a retail box. My copies have been either corporate or educational. – WernerCD Sep 27 '10 at 21:03
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