What is specs of the rest of your system?, Did you uninstall the old graphics drivers before installing the new graphics drivers?
PSU: 750 bronze Cooler master
Graphics card: Sapphire 7970 GHz edition 3 GB
64 GB SSD
1 TB 7200 RPM 64 MB cache secondary HHD
I have uninstalled the graphics drivers and reinstalled from driver CD and also downloaded the latest ones from AMD too.
Its annoying as it works fine BEFORE I have to reboot (to finish install)