Accessing Main Computer from the network.

  Barrie-281802 22:28 24 Feb 05

I have a wireless network set up with the main computer(1) connected to a broadband gateway/router via an ethernet cable and the other two machines are connected via wireless. All computers can see the internet and all can be pinged from all positions. File and printer sharing is on but I cannot access the main computer (1) from either of the other two machines from My Network Places. A message box is displayed (title "Connect to computer" )asking for a username and a password but nothing entered works.
I can access both of the other machines from the main computer via My Network Places.
Any ideas gratefully appreciated.

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