Here is a good link to AMD SUPPORT on how to Uninstall AMD Software: https://www.amd.com/en/resources/support-articles/faqs/PDH-UNINSTALL.html
Here is the link to download and run AMD Cleanup Utility which is similar to DDU (Display Driver Uninstaller): https://www.amd.com/en/resources/support-articles/faqs/GPU-601.html
Here is AMD Auto-Detect Tool and Installer Tool to help download the correct AMD driver for your GPU card and to install it: https://www.amd.com/en/resources/support-articles/faqs/GPU-131.html
EDIT: Those "Release Notes" from those 2 Install/Uninstall AMD Driver links seemed to be broken and needs to be Re-linked to the proper AMD SUPPORT Page.
Installing AMD Software: Adrenalin Edition
For detailed instructions on how to correctly uninstall or install AMD Software: Adrenalin Edition, please refer to the following support resources:
Both of the links above in the "Release Notes" goes to the same AMD Webpage:
The first and second link goes here: https://www.amd.com/en.html
NOTE: AMD has made some major changes to the new AMD Format so there will be bugs showing up where past links become broken as an example.