This is a repeat of a prior post from Nov'11 by Bugbatter, but the FBI is considering doing some sort of internet shutdown on/about March 8, 2012 (as mentioned on the radio today by Kim Komando) to deal with this issue. So it's worth repeating the info again.
"The FBI has uncovered a network of rogue DNS servers and has taken steps to disable it. The FBI is also undertaking an effort to identify and notify victims who have been impacted by the DNSChanger malware."
You can check to see if you're infected with DNSChanger here:https://forms.fbi.gov/check-to-see-if-your-computer-is-using-rogue-DNS