Back when I was running 98 SE and the free version of AVG, AVG discontinued support for 98 SE, so I switched to the free version of Avast!
Works just as well, if not better, as far as I can tell, and now that I've "upgraded" to XP, and am running TiVo Desktop, it's never interfered that I can tell.
Just switch to the free version of Avast!
And add Spybot S&D (also free).