It's a rogue virus (fake antivirus). It says to download fake software that says you have more than 1000 security breaches, viruses, etc (which don't exist). It also says you have to pay for the full version to remove these "viruses". It's aimed at taking your money so if you have no security program it's probably a fake antivirus, if you have antivirus software check to see if they work, if not it's probaly a fake antivirus.
Disconnect your computer to your wireless network (if you have one) if you suspect any virus, fake antivirus included has infected your computer.