Download DDU (Display Driver Uninstaller) and use it in safe mode to uninstall the incomplete installation of your current AMD driver set. Set DDU for AMD.
When you run DDU it will ask you if you want to run it in Safe mode. Click yes, and the computer should restart automatically in safe mode and DDU will start to remove all AMD Graphic display driver and software.
Then retry to reinstall the FULL set of AMD Drivers from AMD Support that you downloaded. Make sure your Windows is fully updated and the internet is disabled before rebooting to the Desktop (This prevents Windows from installing a different Driver before you install the current driver). Also delete C:\AMD Folder before installing the new Driver set.