Registry keys have a last-modified timestamp. You can use Regedit to export a key,
selecting the ".txt" output format. That text file will contain the last modified
NirSoft's RegScanner utility allows one to filter selected registry keys by
ranges of the last-modified timestamp.
I have lots of NAME NOT FOUND as well and there is nothing wrong with my computer. It is not deemed to be a critical issue. Several answers below to that effect. No need to worry.
You can't. Old applications cannot be made high-dpi aware without any changes, because that needs the app to use the newer high-dpi APIs. Apps must declare themselves as high-dpi aware via a manifest file or some API calls, otherwise Windows will scale them bitmap-wise which makes them blurry. That's what the above registry key is about. The detail settings ...