How to fix up fonts displaying only in bold or italic after copying Windows/Fonts?

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http://unix.stackexchange.com – In order to fix up the broken display of some Word (Windows) files in LibreOffice, I copied over the entire /windows/Fonts path to file:// (using dolphin via kdesu). The file displays better, but now many system fonts seem to display either in bold or italic, but rarely they the way they used to. What did I screw up and how can I revert this? (HowTos)