98 or 98 Second edition? There's an awful lot of USB products that will not work reliably with 98, and are still less than completely stable with 98 SE.
It might be worth checking with the manufacturer's web site to make sure that there are no issues with 98 that they are aware of.
A check on line to see if there are any relevant 98 patches might also be worth doing, but it's getting to the point where Microsoft are not doing much support wise with 98 any more, their attitude is that 2000 & XP are now around for so long, 98 is effectively old hat and no longer front line product.
Sorry can't be more helpful, but that's the way the computer industry is headed, obsolete almost as soon as you get it in some areas.