1. Close SQL Navigator.
2. Rename registry key "HKEY_CURRENT_USER\Software\Quest Software\SQL Navigator 7.5.0" to " SQL Navigator 7.5.0bak".
3. Rename folder "C:\Users\username\AppData\Roaming\Quest Software\SQL Navigator 7.5.0" to "SQL Navigator 7.5.0bak"
4. Start up SQL Navigator again.
5. Please make sure "Cancel" is selected when SQL Navigator prompts the import profile settings dialog.