According to the FBI millions of computers have already been affected and during their 2 year investigation, officials made extraordinary efforts to provide clean replacement servers to keep internet users from losing their online access.
The six Estonian criminals created a hack that would redirect unsuspecting users to rogue servers, allowing them to manipulate users’ web activity. For example, when a user of an infected computer clicked on the link for the official iTunes website, they were taken to another site for a business unaffiliated with Apple Inc. that claimed to sell Apple software. These cyber thieves made an enormous amount of money by defrauding legitimate websites & advertisers of huge revenues.
In the meantime, the replacement servers that had been up to assist with "Operation Ghost Click" will shut down on July 9, 2012. Infected computers may lose their connectivity and if you suspect a problem with your computer, visit the link below to determine if you've been infected.
http://dns-ok.us/
For more information, you can visit the FBI's website at: http://www.fbi.gov/newyork/press-releases/2011/manhattan-u.s.-attorney-charges-seven-individuals-for-engineering-sophisticated-internet-fraud-scheme-that-infected-millions-of-computers-worldwide-and-manipulated-internet-advertising-business