Best Way to Remove 1-800-418-4202 Pop-up Scam

If you are stuck at 1-800-418-4202 pop-up, you may always be alerted with a message saying "We couldn’t undo the changes – Contact Support" or a lock screen telling "Warning: Internet Security is at Threat!!! Call 1-800-418-4202 immediately to rectify this issue...". Actually it is a phishing scam that can make its ways to systems via free games, porn website & third party internet search and other sources along those lines.