Ok got it
Anyway something strange happened even if it doesn't seems to be a real problem, here it is: after uninstalling Catalyst and reboot in safe mode, when I clean with DC there are some entries that always appear everytime I run DC, also after reboot, and here they are:
<<<< ATI >>>>
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\R oot\LEGACY_ATI_HOTKEY_POLLER
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\R oot\LEGACY_ATI_SMART
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\ LEGACY_ATI_HOTKEY_POLLER
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\ LEGACY_ATI_SMART
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\Root\ LEGACY_ATI_HOTKEY_POLLER
Registro Eliminato HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\Root\ LEGACY_ATI_SMART
Entries for other filters are ok, they doesn't re-appear.
Is it a problem?
Thanks