To completely exit RegCure Pro, click the X in the upper-right corner of the program.
 

If the program still does not exit, you may have turned on an option to minimize the program instead of exiting it. To set the program to close every time the X is clicked:
 

1. Click on the Settings tab.
 2. Click on General Settings.
 3. Remove the checkmark from Minimize to the system tray instead of exiting.