Hello RGApplin,
Please check for the .pvm file in your Mac HD. By default Virtual Machine file (.pvm file) is saved to either Documents/Parallels folder inside your user folder, or to /Users/Shared/Parallels.
If the .pvm file of your Windows is not in any of the location mentioned above, please check whether the .pvm file is misplaced in Trash. If the .pvm file is in trash, copy it and paste it to any one of these location: Documents/Parallels folder inside your user folder, or to /Users/Shared/Parallels and once the file is copied double-click on it to start your Windows.
Let me know if you have any questions.