Creating Installers (of juce apps) and dependencies

I used visual studio 2010 to create a .msi style installer for a juce app. My beta tester is telling me that every time he runs the app it’s asking for the path to the installer, and if not provided he gets a fatal error. What is up with that? Does anybody know what other dll’s, libraries, runtime packs etc. have to be included in order to make installing to a windows box (xp in this case) a one-click procedure for the end-user? The installer works as expected on my dev machine of course. I tell it to install, it does, and the app works great and doesn’t ask for anything else.