The word "parasite" is new to me in computer terms, but it seems obvious that you've got an invader, possibly a data miner that is set to send reports on your system and system usage.

Possibly more malignant purposes, but the word "parasite" suggests to me more like that first paragraph.

You might contact Norton and report the error message. Chances are they have a cleanup program that would take care of it.

Dave Oesterreich