[Vadikan]

german_user, I've edited your code to make it more readable (hopefully, I did it right.).

UAC pops up when you need to perform an action as admin. Probably you try to copy a file or create/delete it in a folder, in which full rights are needed. For example, inside program files. To test, you can manually perform these operations in Explorer with UAC on, and you'll see which step is affected.

Let me know if it makes sense to you.