Sorry for the delay in responding. You can try removing Norton Internet Security through add/remove programs (select Start-Control Panel-Add/Remove Programs. If that doesn't work, follow this link. This will take you to a page with a removal tool for the anti-virus portion of Norton 2003 Security. Follow the steps there first. Next. go to this link for instructions on removing the rest of the program.
Please post back here and let me know how it went.