 If you used a computer on Friday or went to the bank, got on a plane, or watched the news, it's likely you were affected by the CrowdStrike update. CrowdStrike is a Texas-based firm that provides large networks with cybersecurity updates, antivirus, and malware. Millions of computers had a Windows update on Friday that CloudStrike included some untested code. Their widely used Falcon sensor software is causing Microsoft Windows to crash and display what's known as the blue screen of death.