Problem scenario: You imported an .ova file. But when you start the new VM (from the imported .ova file) you get this error:
"VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot."
What do you do?
Root cause: VT-x has not been enabled.
Enable VT-x. Follow these directions.