How to fix "ERROR #132 (0x85100084) Fatal exception!" in World of Warcraft when using NVIDIA Optimus

1. Right click and select Properties on the desktop shortcut.
2. In the "Target" box, add " -d3d11" to the box and don't forget a space after the ...exe" part.

If you can start the game up with the integrated video card, you just have to set the game to DirectX 11 mode.
You may have to disable "Hadware Cursor" if the cursor doesn' appear in the game.