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If you use a laptop device, connect an external keyboard to test whether Windows responds to the ESC key.

Connect the keyboard to a different computer and check if the same problem occurs.Open the On-Screen Keyboard in Windows (via Start menu > All apps > Accessibility), perform an action that involves the ESC key (e.g., exiting a full-screen application), and check if it works.Load an online keyboard testing tool like, press the ESC key, and check if it registers.Here are several ways to help you determine if that is the case. If none of the fixes above help fix the ESC key, the problem is likely hardware-related. Wait until Windows reverts the operating system installation to the specified restore point.