[libreoffice-users] LibreOffice does not start any more

I have LibreOffice installed on several Windows and 3 Linux machines.
On a Dell Vostro 3500, Win 7 Pro, freshly reinstalled 2-3 months ago,
On this particular machine I noticed a few days ago, that the software 
"Calibre" is
constantly crashing and I get an error message saying:
"No such module as propsys.dll".

Internet search shows, that this is a Microsoft system file.
TODAY I noticed, that LibreOffice is not starting at all (tried all 
sorts of things).

Is there any word about this kind of trouble?
* I do not know where to download that kind of system file (net says: DO 
NOT download it from unofficial sites).
* I would like to do a "system recovery", but noticed, that setting 
those recovery points is OFF by default.
    And since I reinstalled the system recently, there are no points I 
can the system return to.

Does this leave reinstalling LibreOffice as the only option? Will it help?
(Reinstalling did not solve the problem with Calibre)

Thank you.
Thomas

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