You might need to download the drivers for your network device in your PC - but since your PC can't connect to WiFi you would need to use a different PC (or use an installed if you've previously downloaded it or have a copy of the installer).
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Normally the laptop manufacturer would have a website, in which there would be a downloads section where the drivers should be found. Check the website of your laptop manufacturer, i.e. if it is a Samsung laptop, then try searching for "Samsung [insert laptop model] drivers".