Your least expensive option, assuming that you still have room in
your PC for one more card, is to install a SCSI card, and keep your
scanner. If you are using a PC with windows 98, there is nothing
with respect to either hardware or software which should prevent
this, unless all of the card slots are already full.
FWIW, I now use an Epson Perfection 836 SCSI, and I love it- it's
fast, and takes high-quality scans. It's also very Linux friendly,
which is of course the wave of the future