I've found the quarantine behavior to be very frustrating. For example (and this is only one example of several), I have a perfectly innocent file hanging around called Router Upgrade Checker (1.39 in my case):
http://www.routertech.org/viewtopic.php?t=1062
Norton Insight churned and determined that it was a High risk, apparently because Few people use it. It quarantined it, and if I hadn't happened to be around to see the popup notice (or if I hadn't scrutinized the history log), I never would have known.
The problem, however, is that it doesn't offer me a way to exclude it from being grabbed again once I restore it. At first, I thought, well, if I restore it, NAV probably assumes that I want it ignored. What else could it think? Wrong. It will quarantine it again and again.
Even excluding the file in the main Settings area doesn't work.
Call me crazy, but there should always be a simple way to exclude a file when "unquarantining" it, not just sometimes (e.g. "low" risks). And how about asking the user BEFORE quarantining it, assuming the file isn't being accessed at the moment, which the example above wasn't (I hadn't thought about it in months)? Even though I have idle scans disabled, NAV obviously still does them, since it's finding files in areas that I'm not accessing.