The existence of Norton Anti-Theft, pre-loaded on my new Toshiba Qosmio X70-A machine, blocked attempts to extend my AntiVirus software to the same machine.
I have read the two 'relevant' posts (See: How to Uninstall Anti-Theft with a Toshiba Laptop - posted 22 Aug 2013) I could find and attempted the Safe Mode uninstall. My experience has been a duplicate of Uninstall_NAT, in that attempts to uninstall in regular AND Safe Mode have led to the "Sign into Norton" window.
Unfortunately, as this is my first Win8.1 experience.. I cannot find a "Computer" or "Run" equivalent in Safe Mode that does anything but take me back to Uninstall or Change which leads to the Norton Sign In again.
And, of course, use of Windows Explorer only produces the same results.
I have wasted hours trying to uninstall this discontinued product. Norton kills it in early December yet here I am stuck with it.