Apologies, missed your sentence about wireless.The Inspiron 3847 warranty expired on September 13, 2016.Install this WiFi driver. When done, restart the Inspiron 3847.  
Using Netgear router and Netgear extender with Windows 10 and Dell Inspiron 3847 desktop. Until a few days ago, internet connection from desktop to extender to router was fine. Now it is selective in what is connected. Internet Explorer cannot connect, saying no internet connection. Cannot connect to download any Microsoft tools or software. Connection to extender shows it is weak, but thru it, Google connects to anything that is not Microsoft. Speed test show 100/10 MBTS. Spent 4 hours with Microsoft reinstalling Windows 10, no help. System check says adapter working OK. Router check says router is up to date and working OK. My laptop has solid connection via router or extender, depending on where the laptop is located. Phones connect to either one OK. TV connects to router OK. Considering replacing wireless adapter in desktop. Any other ideas?
Inspiron 3847, Windows 10, internet connection problems