I don't like the 50% performance hit induced by NAV scanning. I'm inclined to take a chance on leaving it off much of the time (I have pretty excessive backup tendencies); I'll still run my nightly full system scan and the mail scans should still work.
Problem is, Norton produces an obnoxious alert every five minutes if one disables the auto-protect feature. Thank heavens, this works:
Take the path C:\Program Files\Common Files\Symantec Shared\Security Center\ to locate two files; symwsc.exe and symwscno.exe. Create a new folder in the same directory and place the two files in it rather than delete them (just in case...). You shouldn't get the alerts after this.Thanks shingirai kanyemba.