Try these paths when asked for the Win98 CD:
c:\windows
c:\windows\system
c:\windows\cabs (not sure if w98 has this)
sometimes the files can be found there.
Also you can do a search for *.cab files on your drive and WinRar can usually open them (might be a mission though)
Alternatively the win98 driver can be found
here
Good Luck !
Z1