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I have Ubuntu 12.04 installed on my machine. I also installed Virtualbox so that I can run windows 7.

I set my virtual box with 4 GB RAM and 25 GB virtual HDD and after I press Start, it doesnt boot from the windows dvd in the optical drive, but instead i get this error:

Failed to open a session for the virtual machine win7.

VT-x features locked or unavailable in MSR. (VERR_VMX_MSR_LOCKED_OR_DISABLED).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb}

Do you have any idea what is it and how I could overcome this?

Thank you!

2 Answers 2

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You must enable hardware virtualization in BIOS

Source

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All virtualization solutions nowadays attempt to use hardware assisted virtualization, instead of software emulation solutions (binary translation). One of those hardware virtualization technologies is Intel's virtualization technology(VT-x). Although AMD supports its own virtualization technology (AMD-V), the basic processor virtualization extensions are named after Intel's solution. I would not like to go any further on virtualization theory and such, if you would like to read, this wikipedia article is highly informational.

How to enable VT-x

There are two configurations you should perform if you would like to enable hardware assisted virtualization. Those are:

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