Clearing out computers listed in Network Neighborhood

This computer was part of a network that no longer exists.
However, all the networked computers are still shown in Network Neighborhood
Originally their were 3 networked computers
Station1(this computer), Station2, Station3
If I try deleting any files from Station2 or Station3, The files in
Station1
(this computer) are deleted.
How can I remove these computers from Network Neighborhood

Any suggetions would be appreciated
smg