Had problem of ccc not starting and did the following on a Windows 7 machine:
In Control panel under Programs and features, use AMD Catalyst Install Manager to uninstall AMD software.
Go to C Drive and delete AMD folder. Also in folderr "Program Files" and Program Files(x86) delete any folder with AMD or ATI neme.
Use a free program called CCleaner to clean up Files and the registry.
That worked for me. My guess is that cleaning the registry did it.