If you had got your M51VR-AP157C unit without any P5QL PRO driver CD or the latter is lost, you may choose to follow the links below. Without a special M51VR-AP157C driver to your unit, you won’t be able to use all its ASUS functionality. The basic P5QL PRO driver from Windows is only able to support the minimum X1650 PRO set thereof. You are really in need of a fully-featured authentic P5QL PRO driver.
For M51VR-AP157C download, please just follow the Veriton N260G link.