Windows XP unable to browse the workgroup computer. Cannot even the other computer using computer/NetBIOS name.
If try to run "nbtstat -c: or "nbtstat -r" from the command prompt, the follow error message shown:
Failed to access NetBT Driver - NetBT may not be loade

The registry key HKLM\SYSTEM\CurrentControlSet\Services\NetBT\Parameters\TransportBindName might be blank. Set it to "\Device\" and then reboot the computer