Some kind of antivirus software called "Sophos" or "Sophos Endpoint" is installed on my friends home pc. He has no recollection of installing this and no one he has asked knows either, its asking for an admin password to be able to uninstall it and we don't know anything about it. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.