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Thank you for the information! And here are the files.

This is my current code.
\documentclass[12pt]{article}

\begin{document}
Hello World
\end{document}

But now I uninstalled all Programms again and installed the LyXpackage (means a bundle of programms including miktex and LyX in one Setup) on my SSD and than TeXnicCenter (before i uninstalled it ...

Hallo LaTeX community,

I have a big problem with LaTeX. I was working with LaTeX some time ago in school and now I need it for working in the university, but I keep getting the following message.
Bibtex> I found no \citation commands---while reading file LaTeX1.aux
Bibtex> I found no \bibdata ...