Can’t see some PC/Servers when browsing Microsoft Windows Network

Hi, we are having a problem with all PC/Servers connected to our domain. We can’t see most of the PC/Servers when browsing the Microsoft Windows Network from ‘My Network Places’. I can ping the pc/servers by IP & Hostname, from any PC though, and browse by \\hostname. When browsing ‘Microsoft Windows Network’ from the Domain Controller, I can see all the pc/servers connected to the domain. Please assits.