The Latitude 7440 is on the list of machines that Dell supports windows 10 here but after upgrading neither my wifi or NIC work. Neither is showing up bad in device manager, I've upgraded the drivers on them to the current for 8.1 (no 10 drivers available on my support page for this laptop), BIOS is current. Even tried the l218-LM Intel W10 driver from their page but it says no supported device can be found when I try.