 Fischenbach Did you update all your drivers to Windows 10 as well? If not click the link below to download them and see if the problem still exist. There is also a couple of links below to help you resolve your wireless networking issues as well. Inspiron 5748 Drivers and Downloads Wireless Networking for the Home for Windows 10 How to Turn On or Off Airplane Mode in Windows 10 For me to better assist in troubleshooting, please click my DELL-Dell-Jesse L and send me a Private Message with the Dell Service Tag number and your Dell Order number
I perhaps made a mistake in believing Dell had it together when I upgraded to Windows 10. I can not connect to any Bluetooth devices and no WiFi at all. Laptop stays in Airplane Mode and it cannot be shut off.  I have tried every option I know to correct the problem, except moving back to 8.1, which I may yet do since I have had nothing but problems since moving to Windows 10. If moving back to Windows 8.1 is a viable option, even though it would mean re-installing all my programs, I guess that is a solution.  Worst part, it is now no longer under warranty and I am going to have to pay for support. I am hoping to find a viable solution here.  The device in question is the 1704 802.11 b/g/n 2.4 mhz WiFi adapter.  Any help would be welcome. This Dell is barely a year old. 
Dell Inspiron 17-5748 Airplane Mode Won't shut off, WiFi and BlueTooth Disables