Here we go again.... recent Catalyst suites have become a mess.
I'm not sure but u can try driver cleaner - remove all previous ati stuff - and try again.
or look for omega driver package.
last line is amd support. but beware that support on catalyst suite is a dead end for some cards.
I wanted support for my HD2900 pro due to catalyst suite install fail - and the online support form is a blocked dead end.
the same form wasn't a dead end just 3 minutes ago on a different subject. that means if you want support for a certain card it just gets blocked - dead end.
i was quite shocked by this and eventually gave up - i use old driver and deinstalled catalyst completely.
sorry that is all i can write for the moment.