Borland C++ Builder 6 Error: E2015 Ambiguity between...

Hi,

I am new to BCB 6, and have taken over a program which is producing the following error:

[C++ Error] myprog.cpp(150): E2015 Ambiguity between '_fastcall Sysutils::GUIDToString(const _GUID &)' and '_fastcall Comobj::GUIDToString(const _GUID &)'

The statement in question:

...
       guid = GUIDToString(GD);
...

The header file includes are as follows:

#include <comobj.hpp>

#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ExtCtrls.hpp>
#include <DateUtils.hpp>

#include <Menus.hpp>
#include <ComCtrls.hpp>
#include <Graphics.hpp>
#include <jpeg.hpp>
#include <Grids.hpp>
#include <Registry.hpp>
#include <snmpsend.hpp>
#include <blcksock.hpp>
#include <httpsend.hpp>
#include "synachar.hpp"
#include "PERFGRAP.h"
#include "SHDocVw_OCX.h"
#include <OleCtrls.hpp>
#include <SOAPHTTPTrans.hpp>
#include <Sockets.hpp>

#include <string.h>
#include "voip.h"
         
#include "PERFGRAP.h"

#include "msxmldom.hpp"
#include "XMLDoc.hpp"
#include "xmldom.hpp"
#include "XMLIntf.hpp"
#include <SOAPHTTPTrans.hpp>
#include <Buttons.hpp>

#include "unit2.h"
#include "math.h"
#include "winuser.h"
#include "stdio.h"
#include "dir.h"
#include <windows.h>
#include <process.h>
#include "fstream.h"
#include "lang_tr.dat"
#include "string.h"
#include "HttpThread.h"

//#include "SysUtils.hpp"

//---------------------------------------------------------------------------
#pragma package(smart_init)
//#pragma link "SysUtils"

Please note that the include for SysUtils.hpp has been commented out.

Any help will be most appreciated - the Borland Help is of no use.

Thanks -

Todd