cannot browse network when exit from a domain

Hello everybody

I am a problem with my office computers. Due to a change of office I
removed the domain controller from my network and now I must remove
the computers from the domain and insert them in a workgroup. When the
name of the workgroup is the same of the name of the old domain I can
browse all the network. Otherwise then the workgroup name is different
I cannot browse the network and I receive the error that I dont have
the permission for this network resource (I use an italian XP so I
dont have the exact error in english).

Anyone can help me?

Thanks