Can I use avast! and Norton, McAfee, Kaspersky at the same time?

No. Before installing avast! all other antivirus applications should be removed from the system. Installing two or more antivirus applications at the same time will cause conflicts and your antivirus protection will be distorted.

Please remove Norton, McAfee, Kaspersky, or any other antivirus & Internet security software before proceeding with the avast! installation.