Windows 10 - No connections are available

If you did an upgrade, the driver for the Atheros AR5B97 was taken from your previous Windows installation. This driver sometimes does not work in Windows 10, showing exactly the symptoms you described ("device working properly" and no WiFi connections).

Here is what I did to remedy this problem:

(not sure if really necessary but it was a hint from the net):

Delete all keys below [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network{4D36E972-E325-11CE-BFC1-08002BE10318}] in the registry (after backup, of course). Reboot. Windows will restore those entries with default values.

I uninstalled the AR5B97 driver in Device Manager, ticking the checkbox "Delete driver software". After that, I let Device Manager search for new hardware. The AR5B97 was detected again. I uninstalled this driver as well and also checked "Delete driver software". I repeated these steps until "Delete driver software" was not offered any more.

Now, I had driver version 3.0.2.181 from 2009 installed. This driver worked! WiFi connections appeared, and I was able to connect to my WLAN. From now on, it is possible to update the driver to e.g. 10.0.0.308 (the Windows 8.1 driver) without problems.

There is now even a driver said to be for Windows 10 (64 bit) at http://support.lenovo.com/de/de/downloads/ds103777 This archive contains the latest drivers for Atheros, Broadcom and Realtek chipsets. I extracted the Atheros driver (version 10.0.0.318) and put it on http://home.arcor.de/dac324/downloads/10.0.0.318.ZIP

UPDATE: This driver works as well.

BTW: Thank you very much qasdfdsaq for your comment to the initial posting. Seems that CommView somehow was surviving the upgrade to Windows 10 although the setup denied preserving any apps. Uninstalling all remnants of the CommView driver as described above seems to be the cure for that problem.