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If you want to continue compiling with pdflatex , you can use pgf/ti k Z instead. It produces also PDF output.
\documentclass{minimal}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}[>=stealth,thick]
\draw[<->] (0,5) node[above] {$N$} |- (5,0) node[right] {$v$};
\filldraw[fill=red] (0,0 ...

By the way, your code also gives me a problem; could it be a problem of the program? It says: [...]
It says what? Give the concrete error message from the log file. As I already mentioned, it could be a matter of outdated packages. Add the \listfiles command as very first line to my sample code ...

Your example works fine for me. Perhaps a matter of outdated packages. But its always better to use native PSTricks code for such simple sketches.
\documentclass{minimal}
\usepackage{pstricks-add}

\begin{document}
\begin{pspicture}[showgrid=false](-8,-6)(6,6)
\SpecialCoor
\psline{<->}(0,5)(0,0 ...

Hey!

I'm from Spain and this year I've stardet the degree on Physics. I knew latex from before but I hadn't used it until this year, and I usually have problems so I've think it'd be a good idea to come into this forum to be helped and also try to help!

Hey!
Well this is my first post so I think I should present myself :) : I'm from spain and I'm studying Physics and this year i've started to work with Latex. My problem of today is that I've done a picture with a program called inkscape,and when I was saving I've seen that there was the option of ...