Start button not working windows 7

- Shutdown button not working windows 7
- Shift button not working windows 7
- Ctrl button not working windows 7
- Windows button not working windows 7
- Delete button not working windows 7
- Fn button not working windows 7
- Brightness button not working windows 7
- Keyboard button not working windows 7
- Printscreen button not working windows 7
- Microsoft button not working windows 7