Hum,
and if you do manage to clean the machine,
here`s a
Service Pack for Windows98 SE that contains all Windows98 SE updates from WindowsUpdate site and more... .
(Windows98 SE 1.16.2, only 12.1Mb)
Though you`ll have to update that as well, cos of the .jpeg exploit.... (unless you use mozilla etc)
[ On a clean unpatched machine you may last 30 seconds before your infected... (no one can hear you scream) ]