Removes the specified ADSI object from this group. This does not affect the ADSI object itself, just its membership in this group.
HRESULT IADsGroup::Remove(
  BSTR bstrItemToBeRemoved  //ADsPath of the object
);
 This method supports the standard return values E_FAIL and E_UNEXPECTED, as well as the following:
  Windows NT:  Use version 4.0 and later. 
  Windows CE:  Unsupported.
  Header: Declared in iads.h.
IADsMembers, ADSI Group Object, ADSI Members Object