Question's a bit confused.
'I noticed that there is a workgroup in there' - do you mean in network neighborhood? If so, that will have been created because at least one machine on your network is (or was - 'dead' workgroups persist for a while after all members gone) set up to belong to a workgroup pf that name. So to remove it, all machines must NOT belong to it (but it being there or not should be immaterial to you seeing the network via the domain).
BUT is that the problem - 'connect to my WinNT domain, however it won't see any of the network'. Or is this the problem? (though if you can see a workgroup - can see some of network!).
So, can you explain what your problem is and what you are trying to achieve please.