Sounds like it might be a driver issue. First open you Add/Remove Programs and delete CCC and anything else ATI related. Then download Ccleaner and Driver Sweeper. First run Driver Sweeper to delete EVERY display driver. ATI as well as the onboard drivers, and also depending on your sound output, delete any uneeded sound drivers (I'll assume you're running of the mobo sound so you probably won't need to delete any). Then run Ccleaner and do a registry sweep. Then reboot and reinstall Catalyst.