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I have latest generation Macbook Pro 7.1 (Intel Core 2 Duo) running Mac OS X 10.6.6. I installed Virtuabox 4.0.2 and tried to boot Ubuntu 10.10 64-bit iso. The boot options screen from the live CD came up:

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However when I continued to load the live session, or installer for that matter, I encountered the following error:

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This kernel requires an x86-64 CPU, but only detected an i686 CPU. 
Unable to boot - please use a kernel appropriate for your CPU.

I am not sure if VT-x is enabled or is supported in the Core 2 Duo of my Macbook Pro. But at least, I have both I/O APIC and VT-x enabled for hardware virtualization as told in the Virtualbox manual.

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According to MacTracker, you have a P8600 or P8800 CPU, and Intel says it supports hardware virtualization. – Daniel Beck Feb 13 '11 at 16:15
Still unable to boot 64 bit Ubuntu :( Any ideas? – Aamir Mar 20 '11 at 16:29
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