disable auto scan, symantec antivirus for macintosh 10.1.1

I have a ppc mac 10.4.11. I seldom use it. I never update the software until this week. I installed symantec antivirus for macintosh from university about 4 years ago.

 

Now I find the auto scan is exemely anoying. I read the help. I supposed to find a Symantec Quickmenu, but I didn't find.  Neither I found anything about symantec in system preference. So how can I disable the auto scan?

 

Any help is greatly appreciated. I really hate the auto scan.

 

Thanks a lot.