Norton 2012 & 2013 unfortunatly have a very very low speed of scanning and very bad treatment of detected threats,
(handling of all detected threats, or processing of threats - i mean when Norton detect lots of threats he to slow in deleteang them - sorry i am not good in english :))
Please do something with that bcause other antiviruses much much faster and without low detecting of malware.
I hope Norton Internet Security 2014 will be revolutionary and will be made without errors.
I think this is one thing where Norton not so good (speed of scanning)