About AMD Catalyst Control Center

After updating AMD Catalyst Control Center, problems happens. I can't find the option of switching graphices, and there's an option of Catalyst Control Center, but when I click it, it says can't work. I tried to reinstall the driver, but at the last page of setting up, it usually says  "installation complete (warning occurred during installation)". And the driver still can't work properly. I tried once and once again, and I even restore the laptop, I can't fix that problem. I have an Alienware M17x R3 with the AMD radeon 6990m. Someone can help me with that? Emali me <ADMIN NOTE: Email id removed per privacy policy>. Thank you!