 ABC News, I'm Dave Packer. A massive worldwide computer outage cripples U.S. hospitals, banks, and airlines. A faulty software update from cybersecurity firm CrowdStrike caused customers running Microsoft Windows to come to a crashing halt Friday. Computer chaos from coast to coast and around the world. Tens of thousands of flights canceled and delayed after what many are calling the largest global IT outage in history. 911 systems, hospitals,