OpenGL Quick Fix
1. Open the World of Warcraft folder in your hardrive, typically: C:\Program Files\World of Warcraft. Open the WTF folder.
2. Open the Config.wtf file with a text editing program like Notepad or WordPad. Type the line: SET gxapi 'OpenGL' at the bottom of the page.
3. Save the Config.wtf file with the new edit and close the World of Warcraft folder. Start World of Warcraft normally from your desktop.