you can do this from the install CD ....
the option is there .... but you seem to have missed it
(and honestly I can't remember)
The easiest way is to download a windows boot floppy
http://www.bootdisk.com/bootdisk.htm
http://files.frashii.com/~bootdisk/newjersey/b oot98se.exe
boot from the floppy .....
run the file ... it will ask for a floppy ....
wizz bang for a minute or two - then hay presto .... a boot disc
insert the floppy into the old lappy - switch on
take either cd or no cd options (doesn't matter at this point)
eventually you'll see a:\>
type
format c:
confirm
after a while the process will complete ...
remove the floppy - insert the CD ... reboot
follow the options.
you could well need drivers for the devices ... come back if probs