Hi all
Question - Would uninstalling Norton and re-installing help?
Answer - Why re-install?
*** Subsequent amendment ***
"What Roger may not have spotted is that"
Roger did spot the link and I agree with him that a fone call to Norton MAY get your money back if they cannot cure your problem.
"The previously quoted link is the Norton site itself, so why waste your time asking them the same question?" *** End of Subsequent amendment ***
The thread quotes Norton as not knowing and Norton referring people to the pc manufacturers. (In case you did not know the company is part of microsoft.)
I think that the problem may not actually be a problem, although I do not know what the miniport is used for.
Does N360 itself report a problem? If it does not then ignore it (for 6 months)
My view ....
HOME use - If your router is setup "properly" (another subject) , then If the firewall on each pc is working (even XPs) and (the basics of all antivirus s/w) you are scanning emails and scanning files as/when saved then all else is probably belt and braces for most people.
BUSINESS use - pay me and I'll do it

... leave alone, and at the end of your remaining 6 months licence, install something else.
My apologies for attempting to shorten a subject which has many elements.
What does anyone/everyone else think?

Ray