Cannot remote registry

I am on a PC in a workgroup. If I logon as administrator I can remote other
workstations registry's, however if I logon my workstation as me (I am a
member of the administrators group, just the same as the administrator user)
it gives me an error message of
"Error Connecting Network Registry
Unable to connect to --------. Make sure you have permission to administer
this computer"

Why should I get this error if I am a member of the admin group???

Thanks