Can you ping from one LAN to the other? If so, can you connect by (in run) \xxx.xxx.xxx.xxx(ip address) ? Do you have domain controllers at both sites? One domain or two? Check that the machines on the remote site are using the same WINS or DNS your machine is using, or if you have a WINS/DNS at each site, they have to replicate/zone transfer w/ other. Netbios broadcast messages can't pass routers. Good luck.