TechSpot shows how to (completely) uninstall antivirus software, you can read the article over here.
Whether you just bought a new system with bloatware or you're just seeking greener pastures, you'll eventually have to uninstall security software. Unfortunately, that's not always as easy as it could be, especially with solutions on mass market retail machines. Shady business tactics aside, making security software tricky to remove increases the chances that clueless users don't mistakenly scrap their protection.
It can also wreak havoc if the same inexperienced user installs new security software without removing their previous solution. Fortunately, most companies provide tools and guides on properly uninstalling their products and we thought it'd be handy to provide a consolidated resource with links to removal tools and/or removal instructions.