3 xp computers only 2 work on switch network

1 of my computers can't seem to locate the other 2. I
have tried all the wizards etc and just can't seem to get
it to join in when you look at network connections all
you can see is this computer and when I try to map the
network it say it can find the path I am entering even
though it works fine on the other computers can anyone
offer any futher advice