networking Vista and 98

I've got a network with 2 W98 SE computers, 1 XP, and one Vista. I have
shared files stored on the Vista computer, but they are not accessible to the
W98 computers. Thus far, the W98 computers will display the contents of the
shared/Public folder on the Vista computer, but the files cannot be opened.
Does anyone know if I could create an account on the Vista computer, and use
it on the W98 computers as a login for the shared folders?
The problem does not occur in the other direction. The Vista computer has
full access to shared files on the W98 computers.
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95-98-XP-Vista network in progress...