How to remove Computer Associates Antivirus??

[e_ayt]

I've recently purchased ZoneAlarm Antivirus but upon downloading and installing the AV, an error message pops up saying that Zone Alarm cannot install due to a conflict with the Computer Associates Antivirus and that i should uninstall it first then try again.

I never downloaded that! And i cannot find it in the Add/Remove programs list!

Please help! My computer is currently unprotected and i dont know what to do!