The word is
Half of nothing
Part of one
More or less
Favorite of children
But fully a villain!
Can you guess this word?
Is it a guess if I've supported my reasoning? No - I don't think that's a guess, it's an answer.
I think I almost have an entirely complete answer here, but am still missing three of the main puzzle anagrams (see entries in italics below)...
Your friend has stopped using his computer because he has learned about:
His 17 bullet points...
The young man approached the train station, he had been out on the slopes by himself this morning, but only for a ...