What if you cannot find the original Sony drivers at all? There is a last-resort method.
If you are planning to reinstall Windows, choose wisely based on driver availability.
When you cannot find the exact driver name, let Windows tell you what the hardware is. This works 100% of the time.
The PCG-41213W is likely a regional variant. Double-check with:
Common matches: VPCF121GX, VPCF12M1E, or VPCF13M0E.
Cause: Power management is cutting power to the PCIe slot. Fix: Device Manager > Network Adapters > Intel WiFi > Properties > Power Management > Uncheck "Allow computer to turn off this device". Also, disable "MIMO Power Save Mode" in the Advanced tab of the driver.