Your network card is likely fine if the Wi-Fi icon is missing. Use these troubleshooting steps to quickly bring it back.

You can change nearly any desktop icon on both Mac and PC. To change desktop icons on a Mac, open the "Get Info" menu and paste in the picture you want to use. On a PC you'll need to make a .ICO file, ...

This can be done using two built-in options. This post will help you in doing so. Later, you can also show the network icon again. In the first step, open the Registry Editor using the Run Command ...