orbis2008

hi, thanx for being there i am new to vista and my pc is connected to the rest of my office lan in a peer-to-peer environment.. i have noticed a minor issue with vista that i am not able to see other xp computers on the lan if i type \\<machine name> in the run area, but i cam see them if i type \\<ip address of the machine i wish to see>.... kindly help me with this,,,.. rgds, thanx in advance..