more information that might help you. I "killed" your app because it was completely locked. After that I restarted it (no reinstallation; just double clicked the shortcut again to relaunch) and it worked fine as expected. I think you only have a problem with your start or initialization procedure.

And you should definitely "dual" SHA-1/SHA-2 code-sign your application and installation! Or at least SHA-2 code-sign.

BTW, virtual machines are perfect to find this kind of bugs. You can restart a "clean" Windows OS within seconds and then check if it still locks the app at first run.

Hope this helps.