Some installers miss this file. Copy it manually from an older Vaio driver CD or download from a reliable DLL repository. Place it in C:\Program Files\Sony\VAIO Event Service\ and run regsvr32 on it.
A: That proves the hardware is fine. The issue is 100% software: either the SFEP driver is missing, or the Vaio Event Service is not running. Sony Vaio Function Keys Driver Windows 10 64 Bit
Run the installer in Windows 8.1 compatibility mode AND as Administrator. Also, ensure you are using the 64-bit version of the driver (look for x64 in filename). Some installers miss this file
In conclusion, updating your Sony Vaio function keys driver is essential to ensure that your function keys work correctly on Windows 10 64-bit. By following the steps outlined in this article, you should be able to download and install the correct driver for your laptop. If you're still experiencing issues, try the troubleshooting tips provided or contact Sony support for further assistance. A: That proves the hardware is fine
Without these components, Windows 10 64-bit treats your Fn keys as unknown input devices—effectively dead keys.
Don’t worry. Your keyboard isn’t broken. Windows 10 simply doesn’t include the proprietary Sony driver that translates those hardware commands.
Why does this happen? Because Sony stopped manufacturing laptops in 2014, and official driver support ended long before Windows 10 matured. The proprietary Sony "Vaio Event Service" and "Function Keys Driver" designed for Windows 7 or 8 do not automatically work on Windows 10 64-bit.