i installed and run the program with SU-Privileges, now i tested to install the Program under User-Privileges. I fount out that the problem begins while the .NET Framework is installing. There are a few Errors About Code: fixme:shell:URL_ParseUrl failed to parse I'll give you all output i get. (in the hole installation progess) it's to much to post it here, i'll give u this link. http://www.pfungstadt.de/LOG/log.txt