After installing Windows 10 on your PC, it's possible you'll encounter issues with some of your hardware not working. Unfortunately, this can include your wi-fi card.

Restart your router

The simplest fix you can try first is to restart your wireless router to make sure this isn't the problem. Leave it switched off for 10 seconds, then turn it back on and see
if your Windows 10 PC can find the network.

You may need to reconnect by entering your password again.

Update your drivers

If you still can’t detect any wireless networks, plug your computer into your router using an ethernet cable. This will connect it to the internet.

Next, head to the Device Manager (it's easiest to get to this by searching device manager in the Windows search bar and clicking the top result). and then try updating your wireless networking adaptor to a new driver.

Right-click on the adaptor and select Update Driver Software. Let the system search automatically for new drivers and install any it finds.

Restart your PC to see if this has helped.