At the moment I'm having a problem when trying to view my LaTeX file as a PDF. Whether I do it internal or external I both the error "File not found.".

I have no idea what file it means. I've read somewhere it has to with my Acrobat Reader, but I still can't get it fixed. And I think it's worth mentioning that I work on Windows 7, as I've also read that Texmaker on Windows has some bugs.

Any help will be appreciated!

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Have you compiled the document with e.g. `pdflatex` (Tools --> pdfLateX in Texmaker), so there actually is a PDF file to view? –  Torbjørn T. Feb 26 '12 at 22:55
Also, welcome to TeX.sx! You don't have to sign with your name since it automatically appears in the lower right corner of your post. –  Torbjørn T. Feb 26 '12 at 23:08
That's it, thanks! I'm just starting to learn the program, sorry for the foolish question! –  Floris Devriendt Feb 26 '12 at 23:08
No problem. I added an answer. –  Torbjørn T. Feb 26 '12 at 23:10

The "View PDF" button in TeXmaker only opens an already existing file, that has the same basename as your `.tex` file. Meaning, if you're writing in a file called `MyReport.tex`, it will look for a file called `MyReport.pdf` in the same folder as the `.tex` file, and open this in the specified viewer.
To create a PDF from the source, you have to compile the document. The easiest way to do this is usually to use `pdflatex`, which in TeXmaker is called with Tools --> pdfLaTeX (shortcut F6), after which you can view the PDF (shortcut F7). There are also buttons on the toolbar for both