I was able to fix this by uninstalling v1.0.0.5 of the "Dell WLAN HotKey Driver" and installing the previous version v1.0.0.4.
Hallo, I have a Latitude E5570 that I installed with Windows 7 Enterprise x64. The system has an Intel  Dual Band Wireless AC8260 card as well as an Intel Bluetooth adapter. I have installed the drivers for these network cards (I used drivers from the Intel website). The adapters are working. My problem is that pressing FN+Print (the wireless hotkey) only enables and disables the Bluetooth adapter, but not the WiFi adapter. I have installed the latest version of the "Dell WLAN HotKey Driver". Do I need to install any other software to make this work? If I reinstall the Dell factory install of Windows 7 Pro I am able to enable and disable the WiFi card using the hotkey. Thanks for any help and suggestions, Olaf
Latiatude E5570 Windows 7 Enterprise x64: Wireless On / Off hotkey not working