During writing, I saw an icon to renew LibreOffice and clicked it. After having done that, my computer has gone bananas and behaves like there is a virus in it. I had problems opening my files at first, but there are now only other problems remaining. Where the old desktop icon was, there is now a strange thing with content of 111 MB, which cannot be opened and which does not have a history. What is that? And why does my computer say that I am opening unsecure files or file with viruses? It has not said this ever before when I have udsed LibreOffice and it all started when I installed the new version. Can I undo it??