DNSLocker is a harmful program.
DNSLocker is obtrusive adware that appends on Internet Explorer, Chrome and Firefox as browser extension or toolbar without users’ idea. Ad-supported programs like DNSLocker are often attached with free software, so if you install such freewares but do not read User’s License Agreements and other details in the Install Wizard, some Potentially Unwanted Programs will be installed regardless of your need. DNSLocker will degrade victims’ browsing experience and make entire PC performance weirdly.