WASHINGTON -

It looks like just a small number of Internet users have been affected by the malicious software that could have cost them the ability to go online as of midnight last night.

The malware took over computers around the world more than a year ago -- but for the past eight months, the FBI has been running Internet servers as a temporary safety net to keep the infected computers online. Those servers were shut down last night.

FBI officials have been tracking the number of computers they believe may still be infected. As of last night, there were about 41,800 in the U.S., down from 45,600 on July 4.

As the deadline approached, Internet service providers like AT&T and Time Warner Cable set up their own safety nets to allow the affected computers to keep accessing the Internet.

AT&T says just a "small percentage" of its customers were affected. To make sure they can continue to access the Internet, the company will maintain legitimate Internet servers for them through the end of the year.

This, said spokesman Mark Siegel, gives people "adequate time" to remove the virus from their computers and avoid service interruption.

Time Warner Cable would not say how many of its customers were affected by the virus, but spokesman Justin Venech said the company also set up its own servers to ensure they can get online. Time Warner has no specific deadline, but the company will notify people who are affected so they can fix their computers.

Verizon Communications Inc. said it will "continue to provide extended support to our customers during the month of July - while continuing to instruct them on the necessary actions they must take to resolve the issue on their computers."

The company added that it has notified affected customers "using a variety of methods, including email, phone calls, and postal mail correspondence."

In South Korea, there were no reports from affected computers Monday. As many as 80 computers there are believed to be infected with the malware that may cause problems in Web surfing, down from 1,798 computers in February, according to the government.

"The impact will be limited," said Lee Sang-hun, head of network security at the Korea Communications Commission, a government body. The government and private broadband providers opened helplines and issued warnings. They also asked users to check if their computers were infected and to download antivirus software. South Korea is one of the most wired countries in the world, with more than 90 percent of households connected to broadband Internet.

The problem began when international hackers ran an online advertising scam to take control of more than 570,000 infected computers around the world. When the FBI went in to take down the hackers late last year, agents realized that if they turned off the malicious servers being used to control the computers, all the victims would lose their Internet service.

In a highly unusual move, the FBI set up the safety net. They brought in a private company to install two clean Internet servers to take over for the malicious servers so that people would not suddenly lose their Internet.

And they arranged for a private company to run a website, http://www.dcwg.org, to help computer users determine whether their computer was infected and find links to other computer security business sites where they could find fixes for the problem.

From the onset, most victims didn't even know their computers had been infected, although the malicious software probably slowed their web surfing and disabled their antivirus software, making their machines more vulnerable to other problems.

Efforts to solve the issue have been hindered a bit by a few factors: Many computer users don't fully understand the technologically complex machines they use every day to send e-mail, shop, and surf for information. The cyber world of viruses, malware, bank fraud and Internet scams is often distant and confusing, and warning messages may go unseen or unheeded.

And other people simply don't trust the government, and believe that federal authorities are only trying to spy on them, or take over the Internet, by pushing solutions to the infection. Blogs and other Internet forums are riddled with postings warning of the government using the malware as a ploy to breach American citizens' computers -- a charge that the FBI and other cybersecurity experts familiar with the malware quickly denounced as ridiculous.

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