“Buy a USB WiFi adapter – it works instantly on Windows 7 without drivers.”
“Microsoft no longer supports Win7, so don’t rely on Windows Update. We’ll go direct to the manufacturer.”
If Windows cannot find a driver automatically, you should download it directly from the manufacturer. This is the best approach for specific hardware like Intel Wireless Adapters or Lenovo laptops . How to manually install adapters on Windows 7 - TP-Link