Once you have all drivers working perfectly, create a backup to avoid repeating the search for ever again.
: To maintain full functionality, users typically need the Sony Shared Library , SFEP Driver , and Sony Notebook Utilities to make the "Fn" keys and special buttons (ASSIST, WEB, VAIO) work.
Audio drivers ensure that the laptop's sound system operates correctly, providing users with high-quality sound output.
Look for the on the bottom label. It will say something like: