Google Translate:
What does that mean?
Looking a little closer to this message in 3.png, it is a file from the older NU 16 version. It looks like this may finally be a way of Norton telling users that this version is no longer supported. I'll ask for clarification.
Google Translate:
"2.png" and "3.png" this is a Norton Utilities file. Norton antivirus is installed on the system. I don't think any adware will enter the system.
This is not a Norton Alert. Looks like some kind of advertising pop up.
It looks like you may have picked up a PUP, a Possibly Unwanted Program. While they are annoying, they do not cause damage to your system. Some people actually want the 'Features' offered by these programs. They are usually downloaded alongside a legitimate download when you do not uncheck the option for the additional download.
Norton products concentrate on malware that can damage your system, that is why some PUPs are not detected.
I would suggest a second opinion scan using the FREE version of Malwarebytes. You can find it here https://www.malwarebytes.com/premium/