There are several ways to remove Avast: standard and complete (damaged antivirus settings, Avast does not appear in the list of installed programs), the official utility is avastclear).
How to clear browser cache: Google Chrome, Firefox, Opera, Microsoft Edge, Internet Explorer, Yandex, Vivaldi, Brave, Avast. Clearing cache and cookies.
There are 6 ways how to uninstall Symantec Endpoint Protection: standard Windows uninstall, fix settings (SymDiag), via PowerShell, via Command Prompt, Microsoft utility, completely uninstall (CleanWipe).
How to delete a file (folder) in Windows: from simple deletion (menu, button, cmd, powershell) to guaranteed deletion with protection from data recovery programs.