If you want to uninstall DVdate, proceed in two steps:
1) First restart the application, type F10 to go to the settings page, then click the Preferences tab. There you click Do not save when quit.
Then you quit the application by answering None when asked if you want to save your preferences. In this way, you will completely erase any data that the application has written to your system, either in the Windows registry or in an ini file.
2) Then you have to delete the executable file like dvdate_xxfr.exe that you copied to a folder during the installation. Normally you send it to the trash.
If you follow these two steps, you are sure that no trace of the presence of DVdate will remain on your system, except of course any files that you have produced from your video files through the application.