Fragen? Antworten! Siehe auch: Alternativlos
Workaround:
If you don’t want to wait for a fix, you need to create a new Administrator User Account for your Windows system that only includes letters A to Z, a to z or numbers 0-9 from the basic roman alphabet. For a full list of supported characters, see the table at the bottom of this page. Please note that simply renaming your current User Account will not correct this issue.
Einmal mit Profis arbeiten! (Danke, Sven)