MsgBox(0, "", GetGUID())

Func GetGUID()
    $struct = "dword var1;char GUID[39];char var2[256];"
    $tGUID = DllStructCreate($struct)

    $aResult = DllCall("advapi32.dll", "int", "GetCurrentHwProfileA", "ptr", DllStructGetPtr($tGUID))

    Return DllStructGetData($aResult,"GUID")
EndFunc