The error probably means that for some reason the *.fdl files in the program folder might be read only. Please follow the instructions below and hopefully that should work for you.
- Close all the running programs.
- Double-click on the "MyComputer" icon on your desktop.
- Double-click on "C:\" (local) drive.
- Double-click on "Program Files\MySoftware".
- Double-click on "MyLabel Designer Deluxe" folder.
- Click on the "Search" button at the top of the screen.
- Search for all files and folders.
- Search for "*.fdl".
- Once you get the search results, right click on each file and left click on "Properties".
- Uncheck the box for "Read Only" and press "OK".
- Now open the program again and hopefully that should allow you to customize the label.