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Please download DDU, it is a tool used to clean the AMD drivers.
Clean the driver you have installed actually, then either:
-Download and try to install this version please, 15.7.1 then let the Radeon settings update automatically: Legacy
-Download and reinstall the driver provided by the laptop manufacturer.
In your case the issue lie having your APU GPU needing very old legacy drivers, but your 8790M still support nowadays drivers.
Please let me know your laptop model, good luck and do not hesitate to ask if needed.