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That was a good advice. In my run file it said 'GUI framework cannot be initialized'.

I changed the settings as said on this page and now it works! Thank you so much!!

ok i'm sorry i found a log file. its:
This is pdfTeX, Version 3.1415926-1.40.10 (MiKTeX 2.8) (preloaded format=pdflatex 2009.11.18) 18 NOV 2009 23:17
entering extended mode
**C:/Dokumente*und*Einstellungen/Lisa/Desktop/latex_vorlagen/LaTeXtest.tex
("C:/Dokumente und Einstellungen/Lisa/Desktop/latex ...

That is my example tex file:
\documentclass{beamer}

\usepackage{beamerthemesplit}

\title{Example Presentation Created with the Beamer Package}
\author{Till Tantau}
\date{\today}

\begin{document}

\frame{\titlepage}

\section[Outline]{}
\frame{\tableofcontents}

\section{Introduction}
\subsection ...

Hallo! I just installed MikteX (with Texniccenter) on Windows. When I make a document with \documentclass{article} everything works fine. But if i make a \documentclass{beamer} document it does not creat any output files (only an empty pdf file). I already added beamer, pgf and xcolor packages.
I ...