Enlarge (credit: Enesse Bhé)
Antivirus provider Webroot is causing a world of trouble for customers.

A signature update just nuked hundreds of benign files needed to run Microsoft Windows, as well as apps that run on top of the operating system.
Social media sites ignited on late Monday afternoon with customers reporting that servers and computers alike stopped working as a result of the mishap.

The admin and security pundit who goes by the Twitter handle SwiftOnSecurity told Ars that, at the company he or she worked for, the false positive quarantined “several hundred” files used by Windows Insider Preview. Hundreds of “line of business” apps, such as those that track patient appointments or manage office equipment, suffered the same fate. Webroot was also flagging Facebook as a phishing site.
As this post was going live, Webroot’s cloud-based system for issuing commands to clients was unable to revert the quarantined files. Officials have yet to confirm they would be able to revert all the bad determinations.
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