Norton is nasty piece of shit, it is very resources demanding and you getting all these pop ups if you want to allow this or that. Once you miss the button it is very hard to fix it unless you know what you doing. These guys are not doing it right.
And if you run two antivirus programs in the same time it can cause a collapse of you windows because they start to fight each other.
Not good, when you decide reinstall your antivirus - take old down, restart computer and install new one.