How Can You Remove Trojan.DNSChanger - Trojan Horse Removal Help

"My laptop is infected with DNS Changer Virus. When I click on any link on a webpage, I keep getting pornographic popups. I ran the Malwarebytes Anti Malware and it found two viruses Trojan.DNSChanger and it got deleted. After the laptop was restarted and Malwarebytes Anti Malware was run again it again shows the same two viruses Trojan.DNSChanger. It is not getting deleted."

Trojan.DNSChanger description

Trojan.DNSChanger is a very tricky Trojan horse which can bring you lots of troubles. Mainly, it invades your PC through free downloads. Spam email attachments, malicious links in social media sites and instant messaging programs are its possible sources. Once infected, your PC would act abnormal. Unwanted ads can be brought by it. Some of your programs may crash from time to time. How harmful is it?