Try to boot up in safemode. Usually anything with a NAV at the beginning of it's name is a Norton Anti-Virus related file. You could try uninstalling and re-installing whatever Norton software you are running but I would suggest visiting the norton website to get their cleanup tool. It is notoriously difficult to fully remove norton without using their uninstal cleanup process ( or it used to be the last time I had any of their software which was several years ago)
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