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I fixed it (there was nothing to be fixed actually) just plain stupidity on my behalf.

In order for the commands \latintext and \greektext to function within a separate tex file,you have to write in that file at some point
"...\latintext somelatintext...", but then it's imperative to switch back ...

I can use Greek & Latin characters alternately (by using the commands \greektext & \latintext respectively) but this I can do only within a single (main) tex file. But when I use the commands \latintext and \greektext in other auxiliary tex files e.g. chapters (whose code is afterwards entered in ...

Thanks for the response.

Yes that is exactly what I want to do, write both in greek and in english in the same document, but without using the commands \greektext \latintext.

If you mean going to my texeditor and configuring my default compiler to be Xelatex or Lualatex , I have already tried that ...

During the past few days I've been trying (unsuccessfully) to install the auto-greek package to my PC.

Mainly I used this site for guidance&material http://www.eelvex.net/latex-auto-greek/

The question is how am I going to install the auto-greek package to my system?
(I mean I have downloade ...

Thanks for the answer. I followed your instructions, but it didn't work.Thanks again though.

I have downloaded the installer install-getnonfreefonts, following the instructions at this site http://www.latexbuch.de/install-latex-windows-7/#x1-230005 (3.1.1 Install Additional Fonts). But after entering "texlua install-getnonfreefonts" at the command prompt (without the quotes of course) I get ...