I have the same problem, and can't install drivers to work. I have Radeon HD7870 as a secundary gpu, and onchip Intel HD4000 graphics on Celeron G1610 on my primary monitor, on a ASRock B75M-R2.0 motherboard with the latest BIOS.
I have tried all of the above suggestions, but to no avail...
Here is the "bottom line of the DxDiag:
+++ WER1 +++:
Fault bucket -290705097, type 5
Event Name: PnPDriverInstallError
Response: Not available
Cab Id: 0
Problem signature:
P1: x64
P2: E000022D
P3: igdlh64.inf
P4: b93d1a2931917ac1333f630bae75a761e142c738
P5: iIVBD_w81