They're on line support....sux to put it mildly.
Do you have system restore? You could go back before you installed the Norton update.
Did you install the update via a download or actually have a disc? Sometimes they have issues with download verisons. Heck I got a brand new computer...Norton was supposed to be already installed...and the stupid thing would say...you have to register this product to use it...and it wouldn't LET me register.
I'd click the link to register...it disappeared. I tried going to their website...do it manually...and the website would tell me I entered an incorrect serial number. After about the 10th time of putting the serial number in...trust me...it was CORRECT.
It was madding....