How Do You Start an .Ova for a 64 Bit Guest Server When You Get an Error about Not Having a 64 Bit Processor?

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.

Solution
Enable VT-x.  Follow these directions.