local connection disconnected

I have new Intel P4 computer with XP Pro installed. This is the second time I installed the operating system. It is on a peer to peer network with win98se and XP laptops.
It keeps giving me the message that “local connecton has been disconnected”.I have Netbuie on it and TCPIP.
Could it be MSN messenger?
Does anyone have any ideas on this one.
I have also tried a differnet NIC and same thing.
Thanks in advance