Try a system clean up and a fresh installation.
1. Run the Windows self check tool to check scan and automatically repair any corrupt files found in Windows. There is a guide on how to do it here. What you need to do is run an elevated command prompt (elevated means run it as administrator) and type SFC /SCANNOW. This will generate a statement indicating if errors were found the Operating system and if they were fixable.
3. Update Windows. Install all available critical, recommended and optional updates. Often Netframework and Visual C are included in the recommended or optional updates Windows provides. Windows should always be fully up to date before installing our drivers!
4. Use DDU to sweep the system of AMD drivers in safe mode.
5. Install the latest compatible drivers once the above is completed and check to see if the issue is resolved.
Thanks for your response.
Regarding your ideas I just can tell you it did not help, in detail:
1) sfc scan is okay.
2) are installed
3) the system gets patched each month
4) did use DDU for several times, never came to a complete install. Would always crash, with what is basically a problem with access rights
I got tons of those messages
Finally lost my patience with that crap called AMD Install manager, which in my opinion is totally useless and will make sooner or later bring everyone over to NVDIA graphic boards, which is a pity.
So I did, what I found somewhere on the internet:
Opened an command prompt with administrative privileges, navigated to the bin64 folder of the downloaded and unpacked package and run "atisetup.exe -Install -Output". This worked without any problem and installed everything, what I did not want I uninstalled later via "Programs and Features".
Highly recommended for everyone else with the same problem. As already mentioned AMD should be aware that they ruining their own market with that crap without any need.