Because of this mixed hardware environment, you cannot rely solely on Windows Update to find everything. Many Sony-specific drivers (e.g., Sony Programmable I/O, SFEP, and Vaio Event Service) are not distributed by Microsoft.
Once Ethernet works, connect to the internet for optional Windows Update drivers. sony vaio pcg-61711w drivers for windows 7 64 bit
Search for these by exact file names (e.g., SonyPI.dll , SFEP.sys ) on old driver archive sites. Because of this mixed hardware environment, you cannot
Go to Device Manager → System Devices → Disable High Definition Audio Controller , then re-enable it. Also, ensure the Windows Audio service is running. Because of this mixed hardware environment