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.

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.

The buggy patch was released last Wednesday and was automatically installed on systems running Norton 2009 and Norton 360 using the company’s LiveUpdate system.

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 ...