OK... I am going to guide you into how to uninstall those video drivers, and then get the latest ones to install again.
Power down. Then power back up, and hold the F8 key down until you get to the Safe Mode menu. At that menu select Safe Mode with Networking. Now uninstall all of the AMD video driver and Catalyst items. When done restart the system, and go back into Safe Mode the same way as last time. Now go to:
http://www.piriform.com/ccleaner/download
and download CCleaner ( the free version), and run the registry cleanup part. When thats done, go to:
http://support.amd.com/en-us/download
and download the latest drivers. It should be version 15.7. Install that driver while still in Safe Mode. Once the AMD drivers are installed, restart your system, and lets see what happens this time.