For the second year in a row, adware helpers are the most prevalent type of malware worldwide. These programs cause unwanted pop-up advertising to appear on computers, change browser settings and make computers run slowly, according to Enigma Software Group, which recently released its 2017 MalwareTracker report, revealing common computer infections by type and location. Some of the worst adware helpers can even infiltrate a computer’s control center, monitoring activity and changing settings…