install 'texmaker' and 'MikTex' (editor and compilers)

use pdfLatex Compiler in texmaker. The Compiler will only run correctly on the main tex file. (Webentwicklung_gedanklicher_Rahmen_fuer_den_Einstieg.tex)
You can run the Compiler, and then Show the pdf with the two arrows at the top. Or you can;

Press F1 or click on the "Quick Build" button in TeXmaker. This will automatically run:
pdflatex (first run)
bibtex (bibliography processing)
pdflatex (second run)
pdflatex (third run)
Although this document does not have a bibliography, so this does more than you Need, but its still slightly handier than Always 
Pressing the two arrows.