Can't uninstall all anti virus files.

I would like to uninstall old anti-virus files. Both Virusbarrier and Norton were used at one time.  Both programs have been deleted but I still get asked about Virsubarrier renewal as well as Norton safe files questions....  I've gone thru applications, library folders and I've used Appzapper.  Where are the hidden files?  What am I missing?

You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:
https://discussions.apple.com/docs/DOC-2435
The User Tip (which you are welcome to print out and retain for future reference) seeks to offer some guidance on the main security threats and how to avoid them.
Bear in mind that from April to December 2011 there were only 58 attempted security threats to the Mac - a mere fraction compared to Windows malware:
http://www.f-secure.com/weblog/archives/00002300.html
(I have ClamXav set to scan incoming emails, but nothing else.)

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    Message was edited by: Dave Sawyer

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