my some keyboards letters are not working

Follow these steps to troubleshoot the non-working keys (X, S, W, Caps Lock, Left Shift):

1. Check for physical issues
   • Inspect the affected keys for visible damage, cracks, or if they feel different when pressed.
   • Use a can of compressed air to blow out dust or debris from around and under the keys.
   • Wipe the keyboard surface with a slightly damp microfiber cloth.
   • If keys are cracked, damaged, or have fallen off, this indicates hardware failure and the keyboard likely needs repair or replacement.
2. Test whether the issue is hardware or software
   • Connect an external keyboard to the PC and test the same keys (X, S, W, Caps Lock, Left Shift).
     • If the external keyboard works correctly, the built-in keyboard is likely faulty (hardware issue).
     • If the external keyboard shows the same problem, it is likely a software/driver or settings issue.
3. Check keyboard behavior in another environment
   • Boot into Safe Mode and test the keys.
     • If keys work in Safe Mode, a third-party app or driver may be interfering.
   • If possible, test the keyboard on another PC (for USB or external keyboards).
     • If it does not work on another PC, replacement is likely required.
4. Check Windows keyboard settings
   • In Windows 11: go to Settings → Accessibility → Keyboard.
   • In Windows 10: go to Settings → Ease of Access → Keyboard.
   • Turn off features like Sticky Keys and Filter Keys if they are on, as they can change how key presses are handled.
5. Update or reinstall keyboard drivers
   • Open Device Manager (type "device manager" in the taskbar search and select Device Manager).
   • Find the keyboard under the keyboard category.
   • Open its properties, go to the Driver tab, and select Update Driver.
   • Alternatively, uninstall the keyboard device and restart the PC so Windows reinstalls the driver.
   • Also run Windows Update (Settings → Windows Update → Check for updates) to ensure all device drivers and system updates are current.
6. Determine if service is needed
   • If specific keys remain intermittently or permanently non-functional after cleaning, testing with an external keyboard, and updating drivers, this strongly suggests a hardware failure.
   • In that case, arrange service or replacement for the keyboard or device.

References:

• Mouse and keyboard problems in Windows
• Troubleshoot Surface Pro Keyboard or Type Cover
• keypad issue - Microsoft Q&A
• Keyboard keys malfunctioning - Microsoft Q&A