I run 98se sp1.5 mainly also ..
firefox, fix it utilities(trend micro av), ad aware , and hijack this .
i stay perfectly clean and my setup catches any badies and hangs them at the door .
i pass the symantec security test in full stealth mode . (ports hidden)
I perfur 98se to xp anyday ... but then i can walk thru 98's registry like a day in the park .