new router now-xx beleives its the master browser -event ID8003

Just got a new router at satellite site and now the PDC (nt4.0)at the main site is showing event ID 8003, source Rdr . The master browser has received announcement from the computer xx that believes its the master browser for the domain on thansport NetBT_El90x1. The master browser is stopping of an election is being forced. What causes this and how would I correct it?