Can you help fix my virtual machine? (details inside) Running Virtualbox 3.2.6

Host machine: Windows 7 (64bit - Enterprise edition) on a compal hel80 with a Core 2 Duo T7200

The guest machine is Gentoo Linux (also 64 bit).

Everything was working fine until this morning. The host machine went to sleep while the guest was running. When I woke it up, the machine Blue Screened. After restarting, I tried to launch the guest and I receive the error "This kernel requires an x86-64 CPU, but only detected an i686 CPU."

In the virtualbox log I found the following:
HWACCM: No VT-x or AMD-V CPU extension found. Reason VERR_VMX_MSR_LOCKED_OR_DISABLED
HWACCM: VMX_MSR_IA32_FEATURE_CONTROL=1

There's no option in my bios to enable virtualization, but I assume it's on since I was able to run the guest successfully in the past.

I tried uninstalling virtualbox and reinstalling - using the same guest, but to no avail. I also tried booting (the guest machine) off the install cd, but get the same error. I made a new machine using the same virtual harddrive - same error.

Any other suggestions?