PUP-detection is not always that straightforward as it is being presented.
It is a bit more complicated as often it seems to the average user.
There are PUPs and PUPs. You should get rid of a Potential Unwanted Program (PUP),
when you did not install it yourself with an intent to use it.
You could use some of these tools(programs) that are not outright malicious.
You could decide to remove bloatware PUPs, or adware-PUPs,
whenever they are or seem a nuisance to you.
That is one side of the story.
Then a adware-scanner may also flag programs and tools,
that became installed by the OS or the hardware vendor (Dell, Lenovo, Acer etc.).
Part of those 34 your scanner came up with probably.
But also came as a feature of the OS like uPNP, better switch it off when not needed.
That is the story, bob3160, is hinting at.
Your comp, your choice. Your insecurity also comes as your choice.
I am glad to have been with avast's all this time,
as I could not have written, what I have written here.
They gave us (bob3160 and me) a platform,
where we have learned loads of stuff over the years from this community.
Thank you, avast for that,
polonus