Hello DuaneC1, This might happen when virtual machine configuration files not being read correctly. Please follow as suggested below:
1.Shutdown the Windows virtual machine.
2.Open the virtual machine hard disk configuration: Actions(On the Mac menu bar) > Configure > Hardware tab > Hard Disk 1 > choose Disconnected option.
3.Close the Configuration menu and quit Parallels Desktop.
4.Launch Parallels Desktop and accesses the virtual machine hard disk configuration menu once again.
5.Select the source and navigate to the .hdd file located in the .pvm bundle.You should now see your virtual hard drive file listed in Source drop-down menu.
6.Close the Configuration menu and start the windows Windows virtual machine and see if this works.Thanks!
Last edited: Nov 21, 2017