The PCG-71315L features a physical wireless toggle switch on the front edge of the laptop. If the Wi-Fi driver is installed but you cannot connect, ensure this physical switch is slid to the position. If it still fails, the Sony Wireless State Device driver needs to be manually reinstalled from the system utilities package. Missing USB 3.0 Support
Fortunately, Sony provides drivers for the Vaio PCG-71315L model on their official website. Here are some of the drivers available for Windows 7: sony vaio pcg 71315l drivers for win7
Allows Windows 7 to properly identify the motherboard components and interfaces. 2. Graphics / Video Driver The PCG-71315L features a physical wireless toggle switch
: This is the chassis or regulatory model number printed on the sticker at the bottom right corner of the screen bezel or on the underside casing. Do not use this to search for drivers on support sites. Missing USB 3
Restores your native screen resolution and enables sound hardware.
Ensure the physical wireless switch on the front edge of the laptop chassis is set to "ON." If it still fails, ensure the VAIO Smart Network utility is installed. Tips for a Smooth Setup