Cant put game into fullscreen

I was wondering how to put game into fullscreen? everytime i do it closes my window and freezes my pc and i have to restart

1. You need a windows install in good order.
2. You need your gpu driver to be in good order.
3. You need to turn off "Read-only" attribute of the wow folder.
4. You need to set your resolution or set the game to windowed fullscreen.

Add/edit these in config:

SET gxWindow "1"
SET gxMaximize "1"