If you have the latest network driver then try on it's Driver tab also to Roll Back, or Uninstall and then restart PC to reinstall the driver. Make sure you have the latest BIOS or UEFI firmware, Chipset, Display (Video), Sound, USB3, Bluetooth, Network and all other drivers, or else download and install the latest now. Compare the latest drivers available for download with the ones presently installed in Device Manager reached by right clicking the Start Menu. Update your network adapter driver from the Dell Support Downloads web page here. If you need any assistance I'll be standing by here to help:
Even if you've already tried a step please try or check it again in sequence. I'll give you everything that works to fix Wifi so that at least something will work.
If not you may need to replace it with a nano-USB Wifi adapter which I'll go over a bit later. Let's hope that it only needs a good driver to come back to life. That Intel adapter looks like your wireless adapter. I'm Greg, an installation specialist, 10 years awarded Windows MVP, and Volunteer Moderator, here to help you.
