Can't open 'c:\storage.nv' permission denied #pcbgcode

AlbertHall
 

Just installed eagle 7.6 and PCBgcode on win10.
The PCBgcode files are in c:\users\jim\documents\ulp\pcb-gcode-3_6_0_4
The directories are set as below.
When I try to run PCBgcode I get the message as the subject above.  If I proceed regardless it complains that it can't access c:\settings.
Why is it looking in the root of the hard disk, please?

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