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I want to install Windows 7 64-bit for my physical machine, and then install Windows 7 32-bit as a guess OS in a virtual machine, can this be done? If yes, what virtual machine software to use? My CPU is i5 760.

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Uhhh, your question title and actual question do not match up, the title is basically "64-bit guest on 32-bit host " while your question itself is "64-bit host with 32-bit guest " while with Virtualbox both ways are possible (I have done both) your question is left ambiguous. – Mokubai Aug 6 '10 at 20:33
Sorry for the confusion! And good to know that both are possible :) – Edwin Yip Aug 8 '10 at 9:58
up vote 1 down vote accepted

Yes, it is possible to do that.

The tree top virtual machine software are:

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Yes, this can be done. I have done it myself with Oracle's VirtualBox, using a 32-bit version of Windows XP as the host and a 64-bit version of Windows 7 as the guest. It works pretty well.

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