W98 Using Vista Printer - hangs Vista

I recently bought a Vista computer and am trying to integrate it into my
network of 2 Win98SE computers. I have successfully printed from Vista to a
printer attached to a W98 computer, but I need it to work the other way
around: to print from W98 to a Vista-attached printer.

What I have done:
With the printer attached, starting the Vista computer gave me a message
about drivers installed successfully. With simple file sharing enabled (no
passwords), I went to Control Panel/Printers and enabled sharing. On the
W98 computer, I went to Control Panel/Printers/Add Printer; I chose to
browse to find my network printer which showed up as expected. Following
through the wizard, everything went fine. I then tried to print a test
page, and got the message: "There was an error writing to <my printer
share>. The network printer is no longer available." The Vista machine was
apparently unaffected; however going to Start/Network gave an Explorer
window which never finished displaying the network. I tried to look at the
Event Viewer to see if anything showed up there, but I got the message: The
pipe state is invalid". I could not shut down the Vista machine; it hung up
with the screen saying "Logging Off".

I have read that Vista is much happier with passwords enabled on both
machines, but the behavior is exactly the same. Before printing the test
page, both computers see each other; afterwards, the Vista computer is
invisible from W98 and the Vista computer hangs attempting to display the
network. I tried a "net view" command from a command prompt; it hung up for
quite a while before reporting: "System error 1723 has occurred. The RPC
server is too busy to complete this operation".

Some of the other posts in this newsgroup and elsewhere have suggested some
registry changes for file sharing problems; in particular, the keys
RestrictNullSessAccess, LmCompatibilityLevel, and NoLmHash. No combination
of any of the suggested changes has had any effect on the above behavior.

Any suggestions?