Workgroup computers they can`t see each other

hi

my computer lab network was working well, but we are Format pcs and the problem is the workgroup Network the computers see itself does not see each other.
the lab contains 50 pc's. Not all work because there is breakdowns in electric.and All wires connected to the network Switch.
to setup the network i have instal the definition of the network compatible with the motherboard of the Intel type. Then set different name to all pc's. The same name workgroup
other lab's Managers told me (which have same of my lab equipment and their workgroup network work well and now domain ) They told me to change the name of workgroup and reset again. I change them only(it's like whatever the name it's must be the same) but still the same problem. You know the work on about 50 pc's its tired.

what should i do?
and
Is it possible to turn the network into domain will work well in this situation?



OS=windows xp sp2
and no internet in lab
the switch type is 3COM



REPORTS

Code:

Pinging user5 [192.168.0.5] with 32 bytes of data:



Reply from 192.168.0.5: bytes=32 time<1ms TTL=128

Reply from 192.168.0.5: bytes=32 time<1ms TTL=128

Reply from 192.168.0.5: bytes=32 time<1ms TTL=128

Reply from 192.168.0.5: bytes=32 time<1ms TTL=128



Ping statistics for 192.168.0.5:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Documents and Settings\user5>ping 192.168.0.22

Pinging 192.168.0.22 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.0.22:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Code:

Windows IP Configuration



        Host Name . . . . . . . . . . . . : user5

        Primary Dns Suffix  . . . . . . . : 

        Node Type . . . . . . . . . . . . : Unknown

        IP Routing Enabled. . . . . . . . : No

        WINS Proxy Enabled. . . . . . . . : No



Ethernet adapter Local Area Connection:



        Connection-specific DNS Suffix  . : 

        Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network Connection

        Physical Address. . . . . . . . . : 00-0F-FE-35-8F-FF

        Dhcp Enabled. . . . . . . . . . . : No

        IP Address. . . . . . . . . . . . : 192.168.0.5

        Subnet Mask . . . . . . . . . . . : 255.255.255.0

        Default Gateway . . . . . . . . . :