Connecting Win2K Pro. to WinXP Pro.

I have a small network setup up as a peer-to-peer workgroup. Three machines on the network, 2-XP’s and one Win2k. The IP addresses are set up as static addresses like 192.168.0.xx (‘xx’ is different on each machine), with the subnet of 255.255.255.0. The reason for the static IP’s is the application running on these machines requires this addressing scheme. The problem I have is that the Win2k machine will not communication with the WinXP machines. The XP machines work fine between each other show the Win2k machine in network places, however, when you access the Win2k machine from the XP machine I get an access denied error. I have identical accounts set up in the XP machines. This only seems to be a problem when using static IP’s so, what am I missing?

Thanks.