Note: I also posted this in the Linux Hosts section but I have now verified that this same thing (bug?) is occuring when I boot into WinXP 64-bit edition too which is why I'm posting it here also.
When I suspend my box and then awaken it again, VBox doesn't run my 64-bit guest VM and gives this error:
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VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.
Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.
I rebooted and entered my BIOS. All my virtualization options are set to enable. If I
totally power down my system, then boot, the problem is gone and the 64-bit VM works just fine. If I just reboot, the problem is
not solved and the 64-bit VM does not work giving that error. This problem starts when the machine gets suspended and then awakened. Upon waking up, the symptoms I described above occur and they survive a reboot! Again, the only cure seems to be a power down then startup again (cold boot).
Can anyone else out there who has a 64-bit VM give this a try and report back?
1) Verify that the 64-bit VM works
2) Suspend your host machine then wake it back up
3) Try to run your 64-bit VM again and see if you get the same result I do