Im confused when you say "From here, remove each instance of the Nvidia card you see as well as each unknowndevice. Exit Device Manager and reinstall the latest drivers you can find for your graphics card." Do i uninstall my nvidia driver or what are you talking about
Rig
Laptop Alienware 64bit nvidia 750m
Solution:
I found out you can press fn +f5 to get it to force switch to the other card wait until it gives you a prompt that request you to restart and presto update your card and your good :3