This is the most critical driver for Vaio laptops. Without the SFEP driver, your keyboard Fn keys (brightness, volume) and special hotkeys will not function, and you will see an "Unknown Device" with an error code in Device Manager.
: Sony does not provide official Windows 10 drivers for this specific legacy model. The hardware was originally designed for Discontinued Support Sony Vaio Pcg-81114l Drivers Windows 10
Successfully running Windows 10 on the Sony Vaio PCG-81114L requires accepting compromises. Sony has left the model behind, so success hinges on your willingness to experiment and the specific hardware in your device. If the process becomes frustrating, upgrading your computer's hardware or switching to Linux are practical and effective alternatives. This is the most critical driver for Vaio laptops
(which cover basic audio, storage, and networking). Legacy Windows 7 or 8 drivers run in Compatibility Mode. (which cover basic audio, storage, and networking)
Complete Guide to Finding Sony Vaio PCG-81114L Drivers for Windows 10 The Sony Vaio PCG-81114L