erazor

Sometimes (not always!) I can't acces my win2k-pc from the network neighbourhood of my win98-pc (error message appears - pc can't be found or something like that). When I try to access it with the IP address (opening \\xxx.xxx.xxx.xxx in the explorer) it always works. How can I solve this, so that I can access it from the network neighbourhood, too? Thx, er@zor