install Ubuntu 64bit VirtualBox on Windows 7 machine

[slny]

I'm trying to install Ubuntu 64bit VirtualBox on my Windows 7 machine.

When I click New virtualbox and select Linux operating system, there is only Ubuntu 32bit available. I know my machine is 64bit Win7.

Is there any way to create a Ubuntu 64bit VirtualBox on my Win7 machine?

Thanks a lot!
SLNY

[mpack]

FAQ: I have a 64bit host, but can't install 64bit guests.

[slny]

The CPU is intel i7, which supports virtualization technologies. Also, VT-x is enabled.

How to check or change ownership of VT-x in Windows7?