( CNN ) -- In the wake of a multi-million-dollar online scam , more than 300,000 computer users worldwide could find themselves without Web access this summer . Luckily for them , it will only take a few clicks to clean things up . The FBI announced that it 's created a website where users can check whether they 're infected with malware and remove it if they are . Check your computer here -- http : //www.dcwg.org . The site was at times difficult to access on Monday , presumably due to heavy traffic . Let us explain : In November , six Estonian nationals were arrested on charges of fraud after a two-year FBI probe called Operation Ghost Click . They 're accused of infecting computers worldwide with malware called DNS Changer , which opened up the computers to viruses . The alleged crooks used the access to direct users to their own servers and manipulate online advertising , racking up more than $ 14 million in illegal income , according to the FBI . `` They were organized and operating as a traditional business but profiting illegally as the result of the malware , '' an unnamed FBI agent said in a news release about the arrests . `` There was a level of complexity here that we have n't seen before . '' The FBI originally estimated the scam had hit millions of computers worldwide , but has since scaled back those estimates to hundreds of thousands . They think about 350,000 computers are still infected , including 85,000 in the United States . The U.S. computers included some at government agencies , including NASA . Last month , the FBI announced that it had set up temporary `` clean '' servers to make sure the users impacted by the attack did n't lose Web access . Those servers will be shut down on July 9 , and anyone still infected will be unable to access the Internet afterward . If it had merely shut down the rogue servers , many of those infected would n't have been able to access the Web at all , the FBI said . Most infected users on the FBI servers may not have noticed anything different , although the malware itself may have made their Web access slower and disabled their anti-virus software . Domain Name System , or DNS , servers are what online computers visit to reach the website they are seeking . By routing them to rogue servers , criminals can control which websites a computer visits . By visiting the website set up by the FBI , users can click to see if their computer is infected . An image with a green background appears if they 're OK , while a red one shows up if they 're not . If infected , they 're then directed to information on how to remove the malware . The case against the accused scammers is still pending in federal court . One of them was extradited last week from Estonia to New York to face charges .
Hundreds of thousands could lose Web access after a multi-million-dollar malware scam . FBI set up temporary servers so users would n't lose their Internet access . Those servers will be shut down on July 9 . FBI has set up a site to see if you 're infected and to help you fix your computer .