Getting available RAM with GlobalMemoryStatus()/GlobalMemoryStatusEx() ?

[Kiana]

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

#define MEGABYTE (1024 * 1024)

DWORD GetTotalRAM()
{
	MEMORYSTATUS MemoryStatus;
	ZeroMemory(&MemoryStatus, sizeof(MEMORYSTATUS));
	MemoryStatus.dwLength = sizeof(MEMORYSTATUS);
	
	GlobalMemoryStatus(&MemoryStatus);
	if(MemoryStatus.dwTotalPhys == -1) // overflow
	{
		MEMORYSTATUSEX MemoryStatusEx;
		GlobalMemoryStatusEx(&MemoryStatusEx);
		return (MemoryStatusEx.ullTotalPhys / (1024 * 1024));
	}
	return (MemoryStatus.dwTotalPhys / MEGABYTE);
}

int __cdecl _tmain(__in int argc, __in_ecount_z(argc) _TCHAR* argv[], __in_z _TCHAR* envp[])
{
	UNREFERENCED_PARAMETER(argc);
	UNREFERENCED_PARAMETER(argv);
	UNREFERENCED_PARAMETER(envp);

	_tprintf(_T("Total Available RAM: %d MB\n"), GetTotalRAM());
	_gettchar();
	return EXIT_SUCCESS;
}

Keeps returning & printing 0, any idea why?