The FBI shut down servers Monday morning that were infected by the DNS Changer Malware, according to ABC News.

The pulling of the plug, which happened at 12:01 a.m., could of infected as many as 250,000 worldwide without Internet access. Internet Service Providers (ISP's), such as Comcast, Verizon, and Time Warner Cable, have been working with the FBI since January. They have been instructing those with infected computers on how to remove the DNS malware.

The DNS Changer, according to the FBI, was created by overseas hackers who were arrested in 2011.

"Criminals have learned that if they can control a user's DNS servers, they can control what sites the user connects to on the Internet," according to FBI's website. "By controlling DNS, a criminal can get an unsuspecting user to connect to a fraudulent website or to interfere with that user's online web browsing. One way criminals do this is by infecting computers with a class of malicious software (malware) called DNSChanger."

The DNS Changer malware "attempts to access devices on the victim's small office/home office (SOHO) network that run a dynamic host configuration protocol (DHCP) server (eg. a router or home gateway). The malware attempts to access these devices using common default usernames and passwords and, if successful, changes the DNS servers these devices use from the ISP's good DNS servers to rogue DNS servers operated by the criminals."

According to the LA Times, the DNS Changer problem began as a result of an online advertising scam that ended up infecting millions of computers worldwide. The U.S. had as many as 47,054 users still infected over the weekend.

Comcast, Verizon, and Time Warner Cable told ABC News they informed users by sending emails and old-fashioned letters, making phone calls to them, even putting pop-up messages in their browsers, according to ABC News.

"Time Warner Cable has set up its own DNS servers and any TWC customers infected will continue to be able to use the Internet," Time Warner's Justin Venech told ABC News.

"We do not expect to receive many, if any, incoming customer service calls as a result of this issue," Venech said. Similarly, Comcast's spokesperson said, "We've seen extremely low call volume, but our agents are ready to help customers."

The LA Times provided some advice for internet users who are infected with the malware. "Essentially, what you may need to do is back up your computer, have an expert wipe it clean of the malware, reformat your hard drive and reinstall everything."