In a workgroup environment (no domain controller), your event log contains:
The browser was unable to retrieve a list of domains from the browser master \\ServerName on the network \Device\Nbf_<device number>. The data is the error code.
This problem is due to the Browser service being unable to find a master browser while it attempts to create a list of computers in your workgroup.
To resolve this problem, make sure that the master browser is available. See tip 0148.