Norton Internet Security full system scan and Netflix login cookie

I do a weekly full system scan with Norton Internet Security. It always detects around 20 or so security risks, and deletes them. Afterwards, when I log into Netflix, I find that it doesn't log in automatically, and I have to re-enter the email and password. On subsequent times, Netflix logs in automatically until the time comes to do another Norton full system scan: then I have to re-enter Netflix's email and password again. Is there a way to prevent Norton Internet Security from eliminating Netflix's cookie? (That is what I suspect is occurring.) How do I figure out which cookie and where is it located?