Get Rid of 1-800-518-0956 Pop-up Effectively, How?

1-800-518-0956 pop-up claiming 'your Windows license key had expired' or 'your computer has been blocked for security reasons' is designed to cause distress and help the swindlers promote their questionable service or low-quality products. This fake warning from hxxp://msoft.com-msoft518.info or other similar pages is powered by an unwanted adware or risky program infiltrating your computer system. It usually disguises as an official warning from Microsoft/Apple support or takes the form of BSOD. It is normal that every now and then, a fake pop-up with this 800 number to call gets in your rotation and prevents normal surfing.