Standard way to uninstall any antivirus:
-close all running programs before uninstalling the antivirus
-block or disable the antivirus, if possible, before you uninstall it
-If you can't disable the antivirus, restart Windows in safe mode, then proceed to uninstall it as below
-to uninstall it, using preferably the same antivirus uninstaller
-If necessary when uninstalling restart your computer when prompted
-after you uninstall the antivirus to remove any traces left in antivirus computer using Ccleaner
-at the end of the uninstall process restart your computer.