......I wasn't running norton, but Macafee, and found that the only way to get it back to original condition where it would run on startup was a full format/reinstall...
I experienced exactly the same problem as Jared when I had some options suddenly disappear without warning.
I could only get Norton back into full running order again by doing a complete hard disk format, and a re-install of the program.
(This possibly corrects some faults/missing files, etc, in the System Registry)..?
..interestingly, following this, I also obtained a further FREE automatic virus update for the following 12 months, (normally it costs
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.