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Hi all,

For those of you experiencing similar problems, I think I found the solution. The trick was in the fact that (appearantly) several format files had to be 'built'.
Here's what I did:
- In the start menu, go to Programs > MikTex 2.9 > Maintenance (Admin) > Settings
- in the Formats-tab ...

Dear frabjous,

Thanks for your suggestions. However, indeed I do get the same error if I type it in as you suggest... I was afraid already that something was wrong with the pdflatex.exe installation. We installed MikTex several times, also trying the base version and the complete version, but ...

Thank you for your replies. This is what I typed into the command line:

C:\Program Files\MiKTeX 2.9\miktex\bin>pdflatex "P:\My Documents\TeX\test.tex"

And this is the result:
This is pdfTeX, Version 3.1415926-1.40.11 (MiKTeX 2.9)
pdflatex: Invalid control sequence.

I've just run the simplest tex-file thinkable

\documentclass{article}

\begin{document}
Hello!
\end{document}

It does produce a PDF-file under MikTex 2.6, but not under 2.9. I've checked the output profile definition paths several times, but that all seems fine. The executables pdflatex.exe, latex ...

I have just installed MikTeX 2.9 to replace my old MikTex 2.6 distribution. However, latex doesn't compile under 2.9. I get the following error message:

This is pdfTeX, Version 3.1415296-1.40.11 (MiKTeX 2.9).
pdflatex.exe: Invalid control sequence.

LaTeX-Result: 0 Error(s), 0 Warning(s), 0 Bad Box ...