Attack in Progress? What is Windows System Defender and where did it come from?

(Update at bottom, and How I got rid of Windows System Defender)
This morning at approximately 6:00 AM I had a program show up out of the blue called Windows System Defender. I did not authorize it, did not ask for it and now it keeps telling me that I have Worms, Viruses, Trojans and other [...]

***Hello Friend Greeting Card – EXE file attached.. don’t click..WARNING!

Beware of any Greeting card email. Always check the link before clicking it. Place your cursor over the link and it will show up .. normally. If it does not, then do NOT CLICK the link. This email came without a name of the person who sent it.. that is suspicious itself.. NEVER click a [...]