Hi Nic,
I don't know how.. but I managed to install an important update that gave me problems in the installation of hd 4000 drivers.
"Intel Corporation - Graphics Adapter WDDM1.2, Graphics Adapter WDDM1.3 - Intel(R) HD Graphics 4000"
I then repeated several test.
1.Bios switchable OFF- (only HD 4000 card) - WORKING PROPERLY, NO code 43. But .. why don't intel control panel runs??? And i don't know why dxdiag shows only Microsoft Basic Display Driver.
2.Bios switchable ON - (HD 4000 and AMD RADEON 7650M) . At first reboot.. both code 43.
After Enable both . HD 4000-Code 31 and AMD RADEON 7650M-WORKING PROPERLY.
Not work neither softwares(Intel control panel and amd catalist)