Well, that shouldn't be a problem because what you mean is the default setting for the computer name and not the username itself (at least that is...
Okay so here is my little "workaround" that allowed me to run the Launcher even though my user name contains non-english characters. Basically it's...
Hmm I don't know if that counts or not. I'll give you the little workaround I use when I get home. Maybe it works for you as well
does your Windows user name contain any non-english letters ? I had similiar issues and that was what caused the problem for me.
Separate names with a comma.