AMD Radeon HD 6770 M Graphic Card (ADL_Overdrive6_FanSpeed_Get() is missing) Error

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hi my dreams,
i bought a good laptop with powerful graphic card (AMD Radeon HD 6770 M Graphic Card) but i can not use it.
here is the hp link for the graphic driver :
http://h10025.www1.hp.com/ewfrf/wc/softw...ct=5169917
as you see in that link i have two situations for the graphic driver :
AMD one
AMD/INTEL one
for some reasons the AMD/INTEL one is n't installed on my laptop so i installed latest AMD one and after that i have these info :

Driver Packaging Version : 8.882.2.3-110930a-126477C-HP
Provider ATI Technologies Inc.

2D Driver Version : 8.01.01.1178

2D Driver File Path : /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0001

Direct3D Version : 7.14.10.0855

OpenGL Version : 6.14.10.11013

Catalyst Control Center Version : 2011.0930.2209.37895

as some pro people said your driver is too old, so i went to AMD web site instead hp for download latest driver from there.here is the link :
http://support.amd.com/en-us/download/mo...7%20-%2064
but sadly after completely removing old driver and install new one i losed my graphic driver and i forced back to the old driver and old driver has that error with oclHashCat64.exe.
what do you think and how can i use my gpu(AMD one) with oclHashCat32 or 64?

EDIT
but why the AMD driver from it's web site does not work?
i think because my laptop has two built in gpu inside that one of them is INTEL (low performance = power saving) and the other one is ATI(AMD = high performance = 6770) and because of two of them i have an option in BIOS for graphic card(Fixed mode = manually change between 2 intel/amd gpus & Dynamic Mode = auto change between 2 intel/amd gpus) and i think AMD driver can not handle fixed and dynamic modes and i should use hp driver instead of amd web site...

thanks in advance