Uninstall Symantec Antivirus

I'm having trouble uninstalling my Symantec antivirus products. I first installed them on Mac OSX 10.3, and I'm running Version 1.0 (082). We upgraded our OS to 10.5 a while ago and trasfered everything currently installed. But since the antivirus is so out of date, it doesn't work correctly and is useless. Every time the computer starts we get popup windows giving us errors from the software.

I've already tried removing the application by moving the files from the Applications folder into the trash, but it did nothing. I tried googling this, but nothing useful came up. I'm thinking I'll have to use a terminal command to remove everything, but don't know what to do.

Please help!