Microsoft is offering a free cdrom with all security updates (thru oct 2003) It says it is available fror "Windows XP, Windows Me, Windows 2000, Windows 98, and Windows 98 Second Edition (SE)" When I ordered mine it didn't ask what os so it either detected my WinXp or one cdrom has the updates for all the os. Plus it has a free antivirus and firewall (i am assuming it is the free e-trust they have been giving away). You can read the article here.
and you can order the cdrom here.