Each time Worship LIVE! starts, it immediately checks to see if all the required files are installed. There are a couple dozen essential files, in both the program folder and the Windows system folder. If the program refuses to run because the required files are not installed properly, a log file is generated showing which files are missing and which are present. The easiest way to correct any problems is simply to reinstall the software. If you uninstall first, you will erase all your personalized settings, including your unlock information, so this is not recommended until you have tried simply reinstalling over the original installation (into the same location as before).