Unfortunately, there isn't an online resource available to download the application and the only way to acquire it again is to contact the developer. But first, I suggest you navigate to Start > Control Panel > Uninstall a program and click the ADEL Lock System entry from the provided list. After that press the Change/Repair button next to Uninstall and follow the provided instructions. If it doesn't help or if the Repair feature is not available, contact ADEL.