DNSChanger is a trojan that is causing real problems all over the world. This virus has already infected four million computers, modifying the DNS values of all of them.
DNSChanger acts by redirecting searches towards dangerous websites, from which it is possible for the user to be a victim of a fraudulent phishing operation, where it will be possible to download programs that are actually malware of some kind and, to sum up, sites where it isn't at all convenient to enter. Nevertheless, the Avira computing security company has developed Avira DNS Repair.
This tool will take care of detecting if a computer has been infected and of modifying the DNS values of the computer, returning them to those that are provided automatically by Windows.
The FBI took control of the server from which this malware was propagating substituting them for two of their own that will stop working from the 8 of march 2012 onwards. If you don't want your PC to be have no access what soever to Internet the best thing you can do is use DNS Repair.
Download Avira DNS Repair free and you will be able to eliminate the DNSChanger trojan from your computer.