These are necessary components for the work of Radeon Settings. For example, to manage settings through the overlay and so on. If you do not use Radeon Settings, you can disable them. To do this, open the Task Scheduler and disable the "StartCN" and "StartDVR" tasks. But if you start Radeon Settings manually, the components will start automatically.
Amdow.exe is related to Radeon "Relive" feature.
This User asked identical question previously at AMD Forum: amdow.exe and amdrsserv.exe always running
I delete the amdow.exe in the AMD folder. You can try Autoruns to stop them from starting...sometimes works (you must run it as Administrator)
According to this website AMDDVR.exe concerns AMD Problem Report Wizard and AMD Relive: https://www.file.net/process/amddvr.exe.html.
You can prevent installing AMD Problem Report Wizard during installation of AMD Driver.
According this thread in Reddit, AMDDVR.exe was renamed to AMDRSServ.exe : https://www.reddit.com/r/AMDHelp/comments/aidavh/amdrsservexe_bad_image/
AmdDvr.exe and some related functionality was renamed into AMDRsServ.exe (radeon settings service).
I've encountered similar issues when I received a bsod during driver install and windows didn't fully sync data to disk.
Clearing the driver store using ddu (or AmdCleanupUtility.exe provided by AMD installer package, c:\amd\radeon.....18.x.x\Bin64 folder) while on safe mode generally solves the problem with inconsistent files.
The custom install selection in Radeon Installer runs A.C.U. when you choose 'clean install'