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I have a desktop computer running the latest Ubuntu 12.10 32-bit. I'd like to run RHEL 5.5 64 bit in Virtualbox (4.1.8). However, when I bootup the VM with the CD, I got "You CPU doesn't support long mode, Use a 32 bit distribution.".

The CPU I have is Intel Core i7-3770.

In the system config, I can see that "Enable VT-x/AMD-V" is checked.

What can I do?

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To run 64 bit VMs your host OS has to also be running in 64 bit. Grab Ubuntu 64bit and than install virtualBox for ubuntu 64bit application running latest RHEL5.8 64 or 32 bit as a guest.

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