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LibreOffice does not alter MS Office installation in any way. Absolutely. It might change OS file types associations (if user chooses so at install time), but it neither changes (add/replace/remove) files related to MS Office, nor its data in registry. You may check the installer (MSI) for its actions (requires some competence in the technology, but nothing is hidden), or even source code (naturally available open-source on our repository, as everything related to LibreOffice).

But if you open a .doc in Writer, save it, and after that open it in Word, it's possible that LO introduced some problems into the file - the format is foreign to LibreOffice, and its support is not ideal. It's recommended to use ODF for working in LibreOffice, and only use foreign formats for exchange when required, always keeping latest version of the document as native ODF.