If your VAIO runs fine and you don’t need the extra buttons, the driver. If you want full Fn key support, follow Option 1 or 2 above.
When you perform a clean install of Windows 10 on an older Sony VAIO, the operating system often fails to include the proprietary SFEP driver in its base image. Without this driver, the laptop's motherboard cannot fully bridge communication between the BIOS and the Windows environment. How to Install ACPI SNY5001 on Windows 10 acpi sny5001 driver windows 10
To avoid losing the ACPI SNY5001 driver again: If your VAIO runs fine and you don’t
After reboot, check Device Manager. The ACPI SNY5001 should now appear under with no error. acpi sny5001 driver windows 10