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Windows 10 KB4515384 is the latest cumulative update that Microsoft released on September 10 with a fix for high CPU usage bug and multiple vulnerabilities. Microsoft initially stated that the cumulative update comes without any known issues, but the company has now updated the changelog to confirm a bug affecting both Start menu and Windows Search. Microsoft has also confirmed audio issues in this cumulative update. It looks like Windows 10 KB4515384 is plagued by several other issues as well, including a bug that disables Ethernet or WiFi connectivity. A number of users are reporting on Microsoft community forum, Reddit and Windows 10’s Feedback Hub that network adapters have stopped working after applying this update. “Cumulative update (kb4515384) causes the NIC to fail to enable with a code 10 error. Reinstalling network drivers from Intel or Windows Update sources does not resolve the issue. However removing the update through the ‘Programs & Software’ panel or using a recovery point set *before* the update fully resolves the issue,” a user documented the bug on Feedback Hub. “KB4515384 breaks ethernet and wifi adapters on my PC. Appears to create new devices as they’re labeled ‘#2’ and when exposing hidden devices in Device Manager the previously named devices appear. Uninstalling these / new or old drivers do not fix the issues (i.e. “ethernet unplugged” which it is clearly not). The only option was to uninstall this update,” another user confirmed the annoying bug on Feedback Hub. If you are affected by broken network adapters bug, you can disable and re-enable the adapter in Device Manager, and you might be able to use the adapters again after a system reboot. Follow this on OUR FORUM.