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


You must enable hardware virtualization in BIOS



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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