system
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Sorry but this leads to nothing. 
NPF is NOT the problem anymore!
I did refer to my other problem with the freezing problem because that’s the main reason for not using the newest Avast versions.
I removed NPF but that (freezing) problem stayed!
So please FORGET NPF en just tel me or Avast 4.1.501 is save to use.
(is there a important new facility in newer versions?)
I did not find any information about that.