problem with comptuers not able to see eachother on network

I inherited a strange issue from a friend where the computers are connecting to a really basic file share on a computer acting as a server. The computer is running windows server but is not part of a domain. All of the workstations are not part of the domain either. Some of the pcs can connect to the shares via ip address 192.168.10.10 however some can connect via name \\pebserver. Yet further some can connect by both. i think there is aproblem as when I configure the workstation to receive an address via dhcp I get

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\User2>ipconfig /all

Windows IP Configuration

        Host Name . . . . . . . . . . . . : jdgx280
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Broadcast
        IP Routing Enabled. . . . . . . . : Yes
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : gateway.2wire.net

Ethernet adapter Wireless Network Connection 2:

        Media State . . . . . . . . . . . : Media disconnected
        Description . . . . . . . . . . . : Cisco Aironet 802.11a/b/g Wireless A
dapter
        Physical Address. . . . . . . . . : 00-40-96-AF-3F-DF

Ethernet adapter Local Area Connection:

        Connection-specific DNS Suffix  . : gateway.2wire.net
        Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Cont
roller
        Physical Address. . . . . . . . . : 00-0F-1F-E2-B3-A3
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.1.201
        Subnet Mask . . . . . . . . . . . : 255.255.0.0
        Default Gateway . . . . . . . . . : 192.168.10.254
        DHCP Server . . . . . . . . . . . : 192.168.10.254
        DNS Servers . . . . . . . . . . . : 192.168.10.254
        Lease Obtained. . . . . . . . . . : Thursday, March 10, 2011 1:52:37 PM
        Lease Expires . . . . . . . . . . : Friday, March 11, 2011 1:52:37 PM

C:\Documents and Settings\User2>


Is it me or should the ip address of 192.168.1.X not match 192.168.10.X in terms of being in the same ip range

The computer I am connecting to is a windows 2003 server that is not part of a domain, none of the workstations are part of the domain either. I have added a user account user2 to the server and workstation and with the same password. I can see the shares and access them via ip address by going 192.168.10.10 in my windows explorer but can't access by computer name

here is how the router is configured

Router/Gateway Address 192.168.10.254
Subnet Mask 255.255.0.0
Private Network DHCP Info  Range 192.168.1.200 – 192.168.1.250
Allocated 2
Remaining 49
Timeout


Here is what is in use as taken from router

Device Interface MAC Address IP Address
jdgx280 Port 4 00:0f:1f:e2:b3:a3 192.168.1.201 Device Details  
unknown00C09F38CD3E Port 4 00:c0:9f:38:cd:3e 192.168.10.10 Device Details  Edit Name  
unknownE0CB4EA71A62 Port 4 e0:cb:4e:a7:1a:62 192.168.10.16 Device Details  Edit Name  
unknown0024E82183D2 Port 4 00:24:e8:21:83:d2 192.168.10.11 Device Details  Edit Name  
unknown000D569FB76C Port 4 00:0d:56:9f:b7:6c 192.168.10.15 Device Details  Edit Name