Failed to open a window7 in a the virtual machine on ubuntu

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I had an issue today trying to load a windows virtual machine image into Virtualbox on my Ubuntu desktop computer every time I started the machine I would get the error below.

VT-x features locked or unavailable in MSR.(VERR_VMX_MSR_LOCKED_OR_DISABLED)

To fix the issue I went to Virtualbox software then Settings–>System–>Processor(s)–> change the CPUs Number to  1