Please make sure your video card drivers are up to date, you have installed the latest revision of DirectX (linked for you below), and lastly that you are using our latest LaunchPad for Everquest II.
Please download and run the file linked in the article below. This is a self-extracting executable file that will prompt you to select a folder for extraction. Create a folder on your desktop and direct it to that folder. Once complete, open that folder and run the DXSETUP file to start the actual update itself.
[DX9] June 2010
[EQII] LaunchPad