FYI, I finally got Catalyst Control Center running fine. I tried to install AMD APP SDK ver. 2.8, but the Samples module would never install, so I uninstalled 2.8 and installed AMD APP SDK ver.2.7 which installed without any problems. I have also tried using most recent official driver ver. 126.96.36.199 and beta ver. 188.8.131.52, but GUIMiner DEVICE BOX still only show i7 CPU and does not show ATI Radeon HD 5770 Jupiter GPU as an available device. Any thoughts what to try next to get GUIMiner to recongize GPU device?
BTW, GPU Caps Veiwer 1.18.0 still shows OpenCL: OpenCL 1.2, CPU compute units:8@2833MHz, but when try to run OpenCL demo it gives error message "OpenCL GPU not supported on selected platform. Bye."