Sometimes under certain conditions and cards, the Catalyst drivers
as of late seem like they are installing correctly and report so. Then upon checking the device manager, no new driver
had actually been installed.
Possibly this is what happened here with you? Could you check the device manager to verify that you indeed have the latest installed as you believe to be?
If not, we can work on getting it installed proper for you. If so, then I am not sure how to help.