i don't know about how it works on a Win98SE machine, but i've been using ESET AV software on our dozen-or-so XPPro machines at the office and my XPPro machine at home and i'm pretty pleased with it. it's got a relatively small footprint, doesn't take up a lot of memory, doesn't have any annoting idiosyncrasies and its test numbers are pretty impressive. at any rate, we haven't had any viral infections since we installed it about 18 months ago. price for the XP-compatible version was about $60 for a two year subscription.

good luck.

michael