Norton Internet Security sometimes does the same thing, but it requires a full reboot before it will behave. Fortunately, they don't do this often.

If you are having problems installing Norton Anti-Virus under Mac OS X 10.3.x, you may need to uninstall the previously present copy (NAV 9.0.0) for the "LiveUpdate" component to properly perform ...

Norton AntiVirus 8.0 provides Auto Protect, SafeZone scanning and repair, LiveUpdate scheduling via Norton Scheduler, and command line scanning.

The flaw, which resides within Symantec's Norton AntiVirus 2004 application, could let attackers run code of their choice on a user's system, launch unauthorized pop-ups, or even create a denial ...

I finally decided to use Norton AV2002 with my XP box. After downloading and registering the package, I tried the Liveupdate. It repeatedly failed after starting to download the files.

Norton AntiVirus for Macintosh provides native virus protection on OS X 10.1 through manual scans and repairs. Users can also update virus definitions via LiveUpdate.