Before installing the SonicWall Capture Client, it is necessary to remove all other anti-virus solutions. Please see the following 3rd party links that provide further information on how to uninstall vendor specific anti-virus products.
Uninstall McAfee Products:
How to remove McAfee products from a PC running Windows?
How to install or remove McAfee Cloud AV?
Uninstall CyclanceProtect Home Edition:
How do I uninstall CylancePROTECT Home Edition?
Uninstall Sophos products:
Sophos Endpoint Security and Control: How to remove from client computers?
How to uninstall different Sophos products?
Uninstall Fortinet products:
Uninstall of FortiClient software?
Procedure to uninstall FortiClient when the administrator password is unknown.
Uninstall Webroot SecureAnywhere:
How to uninstall SecureAnywhere?
NOTE: The documentation provided on this article solely belongs to the appropriate vendor. Kindly contact the vendor support if you need further assistance uninstalling the AV.