I'm using Windows XP and I cannot get Total Protection 2013 to fully install. I have input the product code several times. I am so sick of issues like this. I am considering getting a refund and going with another company. I am beyond angry about this.
Did you have another AV installed before Mcafee? If so run its removal tool and activation should work.
Also calling customer service will also help you get it activated that is their bread and butter work.