Uninstall it manually. Virus Protection is the number #1 waste of money on software out there. It causes more problem than it solves and just slows your system down. Just keep your system up to date and don't install software unless you know it's from a legit source. Sorry to be blunt but I have never seen Anti-Virus software be useful except in the case of users who install everything they see on the Internet and in that case it didn't really help either.