98se-->Vista logon

I have an older laptop running WIN98se (I know -- no longer supported!) on
my network with my Vista computer and my WinXP Pro computer.
I have no trouble connecting to and sharing files with the newer computers,
and the WIN98se computer shows the others two in my workgroup, however,
when I try to connect to the Vista computer, it asks me for a password,
which is NOT the one I use to log onto the Vista system.
It appears that the user is IPC$. What do I need to do to either the 98se or
the
Vista computer (or both) to allow me to log on?
Thanks in advance,
Dave