OK, here is a strange one. The computer:
Windows 7 Home Premium, SP1, x64
Intel i7-3610QM 2.30 GHz
16 GB RAM
Qualcomm/Atheros AR9485WB-EG wireless adapter
Wireless Driver version: 10.0.0.255 (7/2/2013)
Windows Updates are up to date
Basically, I have to completely uninstall and reinstall the wireless adapter in order for it to see any wireless networks. The process is like this:
If I boot the laptop at work, the Network & Sharing icon in the systray shows no networks at all. If I uninstall and reinstall the wireless adapter from Device Manager, it will show up all available networks and allow me to reconnect. If I then put the computer to sleep (or shut it down), and then take it home, it once again shows no wireless networks at all. Again, I have to uninstall and reinstall the wireless adapter, and then all of the available networks in the area are accessible. If I go back to work after this, it once again does not see any of the networks, not even the one I was connected to previously.
Manually adding a wireless network, including with the option to connect if the station is not broadcasting, does not work either. No matter what, I have to uninstall/reinstall the wireless adapter before it will see (and connect to) any network at all.
I've never run into this before. It's very bizarre. Any ideas?