virtualbox.org

I'm running Windows 7 64-bit with a i5-2520M CPU and I keep getting the following error when trying to start my VM:

"This kernel requires an x86-64 CPU, but only detected an i686 CPU. Unable to boot – please use a kernel appropriate for your CPU.
Do you know what setting need to be changed? I tried several in the Settings menu with no luck. I also get the same error when I try running it off the local machine."

I also get the same result with a Windows 8.1 64-bit with a i5-3320M CPU.

Running VirtualBox 4.3.6

Any ideas how to fix this?

1) 64-bit guests need hardware-virtualzation enabled in the hosts bios.
2) when creating the 64-bit guest you must select 64-bit in General -> Basic -> version.
3) If running Windows as host you must make sure hyper-v or xp mode is not enabled on the host. MS does not play well and wants it all.