Rendered viewport shading not working in Cycles - Blender 2.71

Hi! Opening the default start-up file in Blender 2.71, changing the render engine to “Cycles”, and selecting “Rendered Viewport Shading”, all I get is a purple image. How can there be textures missing if this is the default file? Is it a bug? Any help appreciated. Thank you.

Solved it, thank you. All it took was installing the latest drivers.