Hi Naveen,
Welcome to this group.
I think there is not much difference in configuring using windows XP
and windows 98. If you have configured your modem, you can just plug
in and start using dataone in windows 98. Keep in mind that you have
to install Network neighborhood portion while installing Windows 98.
all said and done, I 'd recommend not going for windows 98 as it is
outdated and you will need atleast windows xp for most of the
applications and programs.
all the best.