I suspect this is the problem:
This issue occurs if the GCC and PAE kernels are not up to date in the Linux VM and the hgfs folder is not created in the /mnt folder.Debian Wheezy for LinuxCNC has a special PAE kernel for real realtime performance. But I will create /mnt/hgfs as an experiment. That didn't do it. I can either share files with Windows or run LinuxCNC. Instead I am installing the latest Debian release, which I will use for copying files to the LinuxCNC release.