Works after installing .NET from
http://www.microsoft.com/downloads/details.aspx?familyid=E3821449-3C6B-42F1-9FD9-0041345B3385&displaylang=de
http://www.microsoft.com/downloads/details.aspx?familyid=E3821449-3C6B-42F1-9FD9-0041345B3385&displaylang=de