If your installation is getting corrupt for some reason, please follow below steps in order to try to fix it:
1. Uninstall NavBox sw if it exists in Windows "Add/Remove Programs"
2. Search for "NavBoxSW" in the below keys and delete the complete key if found:
3. Open up an elevated command prompt window (Run as administrator) and run the command:
sc delete navbox
4. Delete the following folders:
5. Reboot PC and run the NavBoxSW.msi installer again from the NavStick:\INFO\NAVTOR\Setup\NavBox\