Can’t Browse

I recently upgraded a branch office from WinNt to Win2k Pro (10 PC’s).
Now the upgraded PC’s can only view the local PC’s ( in the Branch’s subnet) and not the rest of the Domain. Prior to the upgrade the complete domain was viewable thru NetworkNeighbourhood.

The Branch is connected via ISDN and the PC’s are using LMHOST, and are loaded with NetBEUI, just like before. There is no BDC at the Branch.
The H.O. IP is 192.168.1.0 and the branch is 192.168.4.0, any help would be greatly appreciated.