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Thank you both very much for your informative answers.

I am installing Texlive, as you suggested Stefan. It is interesting how much larger it is compared to MikTex.

I wish you a great day !

another question, please:

I would like to use Latex for writing scientific documents; for this purpose is TexWorks sufficient or do I need the entire MikTex package ?
what is the purpose of Miktex ?

Thank you again!

Thank you very much, Stefan!
I installed texworks 0.6.1 and it works by clicking on the newly installed version.
However, in windows' startup menu, the texworks icon is still the malfunctioning one and, in order to uninstall the bad texworks I have to uninstall the entire Miktex.
How do I get rid of ...

Good day !

My computer uses Windows 8.1 64b Pro but also has Linux installed (so it may run on either).
I installed the latest MikTex 2.9 but I could not use it:

I opened TexWorks and tried to save the document and, after pressing 'save', invariably it crashed showing the message:

"TexWorks has ...