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My VirtualBox Manager says my OS is 64-bit. The command prompt says otherwise, however, and "About This Computer" confirms it's 32-bit. I wanted to go 64-bit all the way and I have no idea how this happened. Should I have selected the AMD 64-bit version despite having Intel Windows 7 64-bit?

See screenshot:

enter image description here

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    you probably chose to install 64bit but selected the image of 32bit version. check the platform using uname -a – ostendali Dec 14 '15 at 17:32

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The OS shown in VirtualBox Manager is the OS that is chosen when the VM is created. This only affects some other settings and will not necessarily match the OS that is later installed on that VM.

The output of getconf LONG_BIT is not a good way to check whether your OS is 32-bit or 64-bit. A better way is to use uname -a, which will show whether you are running the 32-bit (i386) or 64-bit (x86_64) kernel.

You mentioned that you did not choose the AMD 64-bit version. That is the version that you need for 64-bit, and will run on both Intel and AMD processors that support 64-bit. See the following for more info: Difference between the i386 download and the amd64?

Nattgew
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