It could be either a hardware or software issue. Here are a few things to try: (1) Restart your computer: A simple restart can sometimes fix software glitches that might be causing the keyboard issue. (2) Clean your keyboard: Dust and debris buildup under the keys can interfere with their functionality. Try using compressed air to clean your keyboard. (3) Update your keyboard driver: Outdated drivers can sometimes cause keyboard problems. You can update your keyboard driver through Device Manager. If none of these steps work, then it's more likely a hardware issue and you might need to replace your keyboard. To check if all your keys are working, you can try using a free online keyboard tester tool like bestkeyboardtester.com. This will help you identify any other problematic keys.