A similar thing happened to me after I updated windows 8 to windows 8.1. My wi-fi connection was fine on my phone, but for some reason it wasn't registering on my PC. The airplane mode was off, but my laptop was unable to detect wireless devices, thus the error message: "We couldn't find wireless devices on this PC".
It has to do with the network adapters. You have to update your drivers. These are the steps that I took, which restored my wireless connection.
1.) simultaneously click the windows key + "w" to open the search function on your computer.
2.) search "update device drivers" This will open a discussion box titled "Device Manager".
3.) Find the option that says "network adapters". Mine has three options to choose from. This should be pretty standard on any PC with windows 8
4.) Click on the one that says "WiFi Adapter"
5.) Click on the tab that says "driver"
6.) Choose "update driver"
7.) another dialogue box will open--> select "Search automatically for updated driver software
8.)wait a couple minutes while it installs.
9.) Recheck your network connections. They should be restored! Problem Solved.
God's blessings,
Gabby