my keys changed

This usually happens when the keyboard layout was switched or an accessibility keyboard setting changed.

Try these steps in order:

1. Switch keyboard layout:
   • Press Alt + Shift or Windows + Spacebar.
   • Test the underscore and question mark keys again.
2. Check the active keyboard layout:
   • Go to Settings > Time & Language > Language & Region.
   • Open the language in use and check the keyboard layout.
   • Make sure the expected layout is selected.
   • If there are extra keyboard layouts that are not needed, remove them.
3. Check advanced keyboard settings:
   • Go to Settings > Time & Language > Typing > Advanced keyboard settings.
   • Review whether layout-switching shortcuts are causing accidental changes.
4. Turn off accessibility keyboard features:
   • Go to Settings > Accessibility > Keyboard.
   • Make sure Sticky Keys and Filter Keys are turned Off.
5. If the problem affects many keys and shortcuts behave strangely:
   • Press and release both Ctrl keys, both Shift keys, both Alt keys, and the Windows key once.
   • This can clear a stuck modifier key state.

If the issue started after a key combination and many keys now type the wrong characters, the keyboard may have switched to a different preset or layout. Re-adding the correct keyboard layout can fix it.

References:

• get question mark and keyboard to work - Microsoft Q&A I can-t get apostrophe or question mark on my keyboard. I am English, but sometimes use the Portuguese accent marks
• i cant use certain keyboard for typing, but instead i can only do command such as alt+tab - Microsoft Q&A
• How to reset my keyboard? Combination of "Alt + L " gives weird characters and message is sent automatically. - Microsoft Q&A