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I have a copy of 64-bit 13.10 Ubuntu running on my x201. When I open virtual box and click new, it doesn't show a 64-bit option for Windows 7. Running latest virtual box from virtualbox.org.

How can I fix this?

Thinkpad x201 laptop Intel vpro i5 core

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    Can you provide more information on exactly what you downloaded (or what software source you enabled) from virtualbox.org? Also, do you know if your computer supports hardware virtualization? Most virtualization software these days, including VirtualBox, requires your 64-bit processor to have support for hardware virtualization technology in order to run 64-bit virtual machines: just having a 64-bit system and a 64-bit OS is usually not enough. Sometimes support for hardware virtualization has to be enabled in your computer's ("BIOS") setup utility. What CPU do you have? Feb 26, 2014 at 18:56

6 Answers 6

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Just choose the standard Windows 7 entry. If your host system is 64 bit, VirtualBox will always expose that to the guest, no matter what your settings are (see the VirtualBox manual, Chapter 3. Configuring virtual machines).

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Well, I found the answer myself. Just disable Intel TXT Feature. It works!!

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  • How did you did it?
    – Lucio
    Mar 1, 2014 at 20:33
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    I just need to disable it in the BIOS configure section. Your BIOS may be different. But remember to keep 'vt-d' enabled
    – tejas
    Mar 2, 2014 at 18:38
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First you need to have a computer with 64 bit processor and it supports hardware virtualization.

Then you should enable hardware vritualization through the BIOS setting. For details about setting BIOS, you can refer to Want to install 64 bit OS on VirtualBox?

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Sometimes Disabled Hardware Virtualizations may cause the problem. check that option in your BIOS.

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I'm having this same issue, with a windows 8.1 host. This was not an issue before the latest update to VirtualBox 4.3.8, the previous version 4.3.6 works fine. I recommend you down grade to that till a fix is released.

Older builds can be found here.

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  • I think you just need to disable intel TXT feature
    – tejas
    Mar 1, 2014 at 20:07
  • Glad it worked out for you.
    – ShawnV
    Jun 24, 2014 at 19:26
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BIOS Settings -> Advanced BIOS Setting -> Virtualization [Enabled] (was disabled) All 64bit platforms now show up in VirtualBox

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