Probably what's happened is that your graphics driver has been updated by Microsoft Update - and the Microsoft driver is not compatible with the Catalyst Control Centre.
You need to download and install the complete, latest catalyst driver & control centre all-in-one package for Radeon graphics cards. ATI is now owned by AMD.
Their driver page is here: http://support.amd.com/us/gpudownload/Pages/index.aspx
Uninstall existing driver and control centre first!
You need to download and install the complete, latest catalyst driver & control centre all-in-one package for Radeon graphics cards. ATI is now owned by AMD.
Their driver page is here: http://support.amd.com/us/gpudownload/Pages/index.aspx
Uninstall existing driver and control centre first!