Instructions
Launch "World of Warcraft."
Press the "Esc" key on your keyboard at any time during gameplay to access the "Options" menu.
Click "Video."
Click the box next to "Windowed Mode."
Click "Okay" in the bottom right corner of the screen. The game changes from full-screen to windowed mode.
Click the "Minimize" button in the top right corner of the "World of Warcraft" window to minimize the game. Click the game in your taskbar to maximize it.