Norton Security w/backup causes my shutdown time to go from 3 seconds to 15 minutes (timed). I confirmed this by booting in safe mode which brings back the 2-3 sec shutdown time. I also tried a clean boot which disables everything but Norton and shutdown time was back to 15 minutes. Uninstalled NS and shutdown is back to 2-3 seconds.
What can NS possibly be doing for 15 minutes on a 3.4GHz i7 machine at shutdown.This is a major annoyance and productivity killer. I'm surprised no one else has reported this.