An open-source driver pack. It’s safe and lightweight. Use the “Index” mode to only fetch drivers for your specific missing hardware IDs (found in Device Manager).
Upgrading to Windows 10 on this specific model is a mixed bag because Sony does not provide official Windows 10 drivers for VAIO models originally pre-installed with Windows 7. Download Sony VAIO PCG-81114L Drivers for Windows 10 & 7 Sony Vaio Pcg-81114l Drivers Windows 10
Run the Realtek installer, then manually update the Wi-Fi and Ethernet drivers. An open-source driver pack