I found a solution for my computer.
I have an HP Envy that had upgraded to Windows 10 and was getting code 43 errors on both my Intel HD Graphics 4600 card and GeForce GT 740M. I had tried rolling back, re-installing, clean installing, updating, etc… the drivers for both these adapters multiple times.
I cannot believe this worked, but I installed the Windows 10 driver for this device - a “JUA350 USB 3.0 HDMI Display Adapter” (found it here - [url]http://j5create.com/support.html#jua350[/url]). I do not have this device, I just downloaded the driver and installed it. Rebooted my machine. Both display adapters no longer have code 43 errors!!!
I have no idea why it worked, but I have looked for a solution for this problem for months, hoping that intel or nvidia would solve the problem with an update, or hp for that matter, and somehow stumbled across this solution!
Good luck.