Trying to install Windows 7 Pro 64-bit, only 32 installs

Discussion in 'Windows, Linux & Others on the Mac' started by adamZero, Oct 22, 2011.

  1. adamZero macrumors newbie

    May 23, 2011
    Hello everybody,

    I have a DVD of Windows 7 Professional 64-bit and I am trying to install this on my iMac (11,1; 2.8 GHz quad-core i7 etc). The problem is that when I install it and check out the properties, it says I have 32-bit W7 Pro installed. Has anyone had this problem before? Any ideas on how to fix it?

    All help is appreciated!

    EDIT: according to this, my computer should be able to take advantage of the 64-bit OS.
  2. ibuyufo macrumors 6502

    Sep 22, 2007
    I am pretty sure you have the 32bit windows 7 disc. There are two disc version one being 64bit.
  3. sngx1275 macrumors regular


    Jan 27, 2009
    Yeh. It sounds like you are installing from a 32bit install disk. Confirm you are installing from a 64bit source.. I've only bought the student version so I'm not 100% sure, but I don't think there are disks with both 32bit and 64bit on them..
  4. Bob Coxner macrumors 6502a

    Mar 24, 2011
    You can check the hash and/or checksum to see which iso you have.

    Here's the MD5 hash for the 32bit iso version of Win 7 Pro.


    And the checksum


    If this is the hash you see then you have a 32bit iso.

    Here's a free program to check these numbers:

    Hash/checksum values are used to determine whether a file is genuine or has been tampered with. They can also be used to identify an unknown file.
  5. adamZero thread starter macrumors newbie

    May 23, 2011
    Thank you all for your replies. I torrented and burned a 64-bit .iso and installed, and now I have 64-bit Windows working.

    I had received the supposed 64-bit disk through MSDNAA for my school, and I checked the receipt and it claims to be 64-bit, however it seems that there was some sort of mixup with that.

    Thanks again for the suggestions, you were right that my DVD was wrong :)

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