If you thought that was bad, my brother had a McAfee trial pre-installed when he bought his laptop. When it expired, it blocked his internet connection. So, I thought, let's remove it, then. Well, no. Going to control panel, selecting McAfee Security Center (or whatever it's called) and clicking Change/Remove did nothing, except making Windows Installer think it was running an installer, preventing me from removing anything else. I had to go through Safe Mode to successfully remove it. A couple of years earlier when helping someone else, I had a similar problem with Norton Internet security, where removing Norton also removed the 'System Tools' directory in the Start Menu. tldr; Seems like the Antivirus tools are becoming viruses themselves.