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BOOL _Is64OS()
{
    typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
    LPFN_ISWOW64PROCESS fnIsWow64Process;
    BOOL bIsWow64 = FALSE;
    fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress( GetModuleHandle("kernel32"),"IsWow64Process");
    if (NULL != fnIsWow64Process)
    {
    fnIsWow64Process(GetCurrentProcess(),&bIsWow64);
    }
    return bIsWow64;
}