Win8 graphics drivers gets uninstalled after booting 10.8.2

[ShubhamSSJ]

Hi

I have a Samsung NP300E5V-S02IN laptop with

Intel Core i3-3120m , Intel HD4000 Graphics

AMD HD8750m graphics card (Switchable)

4GB DDR3 RAM

HM75 Chipset mobo

Atheros AR9485 wifi chipset

Realtek RTL8101E

I am dual booting Windows 8.1 and Mac osx 10.8.2

I installed Mountain Lion 10.8.2 and have everything running including full QE/CI , sleep , speedstep,lan etc but the problem is when i switch off mac os and then boot Windows, the graphics drivers in Windows are uinstalled i.e. Device Manager shows that Windows is using Microsoft Basic Display adapter.

I reinstall the drivers but the same happens every time I boot windows .

Please Help !!!