“You gotta see this video” From your friend. Do you click on that email, or not?  Most of the time you should not click on links even if you know the sender, even on Facebook! Nothing against your friend, but ya gotta keep your pc safe and clean.  “Won’t my anti-virus fix it?”  Not all the time! Anti-virus programs are there for your protection, but you still have to be careful, and be aware of what you are clicking on.