Is Aero Enabled?

typedef HRESULT (WINAPI *pfnDwmIsCompositionEnabled)(BOOL *pfEnabled)  ;

hSysDll = LoadLibrary(_T("dwmapi.dll"));
if(hSysDll) // Loaded dwmapi.dll succefull, must on Vista or above
{
    s_bVista = true;
    s_DwmIsCompositionEnabled = (pfnDwmIsCompositionEnabled)GetProcAddress(hSysDll,
                                "DwmIsCompositionEnabled");
}