✔ BEST WAY To Uninstall Antivirus from Windows: How to Remove previous Antivirus software the right way!
It is very important to remove any trace of a previously installed antivirus software, because you can run into trouble when trying to install another another antivirus version if its not uninstalled correctly from your system before installing your new Antivirus product.
Most people uninstall using the Windows Add/Remove Programs feature that’s built into Windows, although the tool removes most programs without any problems, when it comes to antivirus programs its not good enough to do the job the right way. When removing antivirus products from Windows, you have to remove every trace to successfully be able to install new antivirus. Windows leave many items behind which could cause error when install another AV. I have list below a link with all the uninstallers for antivirus venders.
Comodo Internet Security
Microsoft Security Essentials
Norman Security Suite
Spybot Search & Destroy
Download Antivirus Uninstallers