WinXP vs. Win98SE Network issue

>Hi everybody!
>
>Got this really annoying situation.
>My Laptop has WinXP home installed witch I have connected
>to a network with two desktop computers witch have Win98SE
>installed. I can see the computers in the specific
>Workgroup that I'm in to, but when trying to connect to
>one of the win98 computers from the WinXP Laptop, by
>double clicking on it, it just says: \\"Computername" is
>not available. bla bla.... Could not find bla bla.
>
>But if I go through the "Run", and there enter the
>specific IP adress of one of the Win98 Computers, it
>works! I get a new window with all the shared resources on
>the win98 computer.
>
>What cause this strange behavior?
>
>/Chrille