I have a problem with my TeXStudio. I am using a portable version (2.9.4) together with the latest MiKTeX.
Everything used to work just fine and now that I have to finish my work from home instead of my pc at work suddenly nothing works anymore (it's still on the same thumb drive).
The configuration in TeXStudio is the following:

There are two errors occuring when i want to compile a document (I am using pdflatex):
It says that the command "../MikTexPortable/miktex/bin/pdflatex.exe" -synctex=1 -src -interaction=nonstopmode -enable-write18 "Projektdokumentation".tex could not be started.
It also can't find the .sty file for the booktabs-de package.
When I compile something simple like
\documentclass{article}
\usepackage{booktabs-de}
\begin{document}
Test
\end{document}
with the MiKTeX command line everything works just fine.
I have already tried reinstalling the package using the package manager. The on-the-fly package installation is activated but does somehow not start when it is needed. I have already updated the FNDB or how it is called.
I am completely new to LaTeX and English is not my native language, but I hope that I could explain my problem and that there is someone out there who can help me.
Thanks in advance!
cdto the texstudio folder and then typetexstudio.exeto start it. – Ulrike Fischer May 19 '15 at 13:20../miktexPortable/...., try withpdflatexalone. – Ulrike Fischer May 19 '15 at 13:45pdflatexand then opened texstudio.exe through the miktex command line. Now it shows the same error with: "pdflatex -synctex=1 -src -interaction=nonstopmode -enable-write18 "Projektdokumentation".tex" – epicake May 19 '15 at 13:59