DavidR
3
You can’t install XP SP2 on a win98 machine, unless you are talking of upgrading win98 to WinXP.
avast! is compatible with, win98, win98 SE, and WinXP sp1 or sp2.
Also see the avast! website, http://www.avast.com/eng/avast_4_home.html#5 for full details.