Re: Windows ETH Miner all cards disabled "error 43"

You need to use AMD Pixel Clock Patcher tool

Download from here - https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

Run it and reboot.

It modifies the drivers to allow running of non-signed custom BIOS which sounds like the problem you are having.

Solved my problem, with a 4 GPU rig. My other rigs didn't seem to have the same problem because windows update was turned off i guess...