Zack Whitaker of ZDNet says “Tough day for anyone running Webroot antivirus.”
The company issued a malware signature update on Monday, which made the software mistakenly flag Windows system files as malware. This affected managed systems worldwide.
“The problem began in the afternoon on the US east coast when the antivirus product began falsely marking those files as W32.Trojan.Gen, otherwise known as generic malware. That moved crucial system files essential to the operating system’s effective functioning to quarantine, making them unavailable to Windows.”
See original ZDNet article by Zack Whittaker here