98/2000 problem

I have a small 8 computer network with 3 computers witn 2kpro and 1with xppro and 5 with 98 I am having a problem with my 98 machines to be able to access the files on the 2kpro machines, if I make a shared folder on the 2k machine then all the 2k machines can access it and the xp machine can access it but the 98 machines can’t even see the shared folder.. help???