you need to manually download and install .net 4 framework (web installer is fine) separately... the windows update version is not enough!
http://www.microsoft.com/download/en/details.aspx?id=17851
I don't mind, because you did a great job with the software and are very kindly in helping. But yes, it would be better, if you overwork your wiki, because for me as a beginner, it was not exactly clear, what I really need to install and where I can get it. And in what order I have to install it.I will put this into wiki