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Before I waste my time trying is this possible?

If not, i'll just install win 7 x86 on the VPC.

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Anybody actually succeeded in doing this? I have a x64 supporting hardware and still VirtualBox errors, saying 64bit not supported by host. –  Eran Aug 19 '09 at 12:34
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To answer your second question: You need to check in the BIOS of your machine if the Virtualization Extensions are enabled, if your motherboard supports it. Disclaimer: I wrote a article on this topic available here: diago.co.za/articles/… –  Diago Aug 19 '09 at 13:23

5 Answers 5

up vote 10 down vote accepted

You can install a 64bit guest OS on a 32bit host if your hardware is x64 compatible, and your virtualization software supports it. At least VirtualBox does, but I believe Virtual PC does not.

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Dammit +1 For beating me by a minute. –  Diago Aug 18 '09 at 20:39
    
The current release of Virtual PC (version 2007) actually doesn't support x64 guest OS's at all. I think the new Windows Virtual PC for Windows 7 will; I hope. –  Chris Pietschmann Aug 19 '09 at 8:33
    
@Chris The 64Bit Virtual PC for Windows on 7 does have limited 64Bit support. There is a push for it to happen however it will be a while after release. –  Diago Aug 19 '09 at 10:41

VirtualBox does support this in certain scenorios but generally no.

Factor Mystic posted the details before I got a change to edit.

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Like the first answer described it. Yes, you can. Just make sure you enable 64bit on the CMOS settings, this option is only available if the processor is 64 bit compatible.

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Depends if your processor supports enumeration of x64.

I'd go with a fresh install if you have access to the RTM build. You'll see a jump in performance over a VPC installation.

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Some hypervisors (VirtualBox and some versions of VMware--maybe also others) do support 64-bit guests on 32-bit hosts, as long as your CPU is 64-bit, supports Intel VT or AMD-V, and has VT or AMD-V enabled: http://serverfault.com/questions/52442/can-an-x86-host-run-x64-guests

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