Browsers crash, system-wide stuttering, Wi-Fi drops

April’s Patch Tuesday made browsers crash or lose internet access with error 0xc0000022. System-wide stuttering affected mouse movement, UI animations, and video playback — the entire computer felt like it was running through molasses. Wi-Fi connections dropped. The taskbar misbehaved. Installation failed for many users. In an era where computing happens primarily in a web browser, shipping an update that crashes browsers is roughly equivalent to bricking the computer for most users’ purposes.