Look, I like this program, but why the heck did whoever made this program need to force us to change our windows user names to Latin Characters? Really? You expect me to change my windows username and potentially screw up my computer just because you don't speak english or something? It's absurd.
Go back and fix this because nobody uses Latin characters for their windows username, and to make people change them is asking for trouble. If you can't make it work with normal characters then delete it because it's just a bad design.