An estimated 20,000 PCs in the UK could be cut off from the web today as a consequence of the DNS Changer virus.
Infected machines will no longer be able to access websites, e-mail, chat or social networking sites such as Facebook.
Worldwide, 350,000 computers could lose web access because of the DNS Changer virus, the FBI has warned.
In 2011, an international group of law enforcement agencies, including the FBI, arrested the group operating DNS Changer malware botnets. But hundreds of thousands of computers remain infected and are currently using interim systems set up by the FBI to access the internet.
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But today, all computers still infected with DNS Changer malware will no longer be able to access websites, e-mail, chat or social networking sites such as Facebook, when the temporary systems will be disabled because of high operating costs.
To check if a computer is affected and find out what to do about it if it is, visit the DNS Changer Working Group site: www.dcwg.org/detect/ and follow the relevant links.