DNSChanger is a trojan horse that might currently be affecting your computers. If your computer is infected (and you will not know if it is unless you check with the site below), your computer will not connect to the internet as of July 8th because the FBI will shut it off. So please check to see if its affected and get rid of it.

To check if your infected: http://www.dns-ok.us/

For more info: http://download.cnet.com/8301-2007_4-57467164-12/what-the-dnschanger-malware-is-and-why-you-should-care-faq/