Smart Definitions turned it's self on

Just started my pc, and noticed the norton widget advsing me that “attention is required”, when i opened up norton it was performing a quick scan. When the quick scan finished i performed an update, to which it proceeded to download something around 75meg, I thought oh right a new version was coming. When this finished downloading i felt strange norton hadnt asked for a restart, so i just checked to see if my smart definitions were still turned off, only to see them on! Had to de-select again and then download the 135meg file! Whats going on ?