Windows users mystified as antivirus accidentally cripples computers

A major gaffe has crippled Windows computers running antivirus program Webroot. The security provider issued a seriously flawed signature update on Monday, which mistakenly identified hundreds of crucial Windows files and legitimate apps as malware. It proceeded to shut them down, completely crippling users' computers in the process. Webroot customers were also unable to access Facebook, which the update had marked as a phishing site. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.