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Thousands of computers running Microsoft's Windows XP operating system were unable to connect to the internet after installing an anti-virus update.
Users said they were also unable to access their internal company networks.
Russian IT security company Kaspersky Labs told users to disable its anti-virus software or roll back the update.
Two hours later it issued a fix - but since their PCs were unable to auto-install new code from the net, users had to perform several tasks first.
Anti-Virus Update Blocks Net Access For Windows XP Users [bbc.co.uk]