Catalyst error – No AMD graphics driver is installed

I have just managed to build a functioning, working HTPC or so I thought. A few days ago I opened up Catalyst and I got this error. At first I thought I would just have to reinstall the drivers but today I did a few more tweaks and got the same error. Do you know what I am doing wrong?
Thanks

Graphics
No AMD graphics driver is installed, or the AMD river is not functioning properly. Please install the AMD driver appropriate for your AMD hardware.
OK
