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I already solved the problem. Apparently MiKTeX has problems with the option "Ask me first" for the option "Install missing packages on-the-fly" . I chose "yes" instead and now the missing packages do get installed immediatly, which solved my problem. Thanks anyways. I hope this post does help ...

Dear community,

I am quite new to LaTeX and TeXnicCenter. I'd like to use it for writing a letter, but I already fail on the document head and I don't know why.

The following document does not work:
\documentclass{scrlttr2}

\begin{document}
Hello world!
\end{document}
LaTeX does not compile ...