Go to Device Manager > Network Adapters, select Wifi adapter, then Power Management tab, clear the check box to 'Allow the computer to turn off the device to save energy.' Then on the Advanced tab disable any energy-saving options. Try also all older drivers from Update Driver > Browse > Let Me Pick list working backwards. 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 drivers from the PC maker's Support Downloads web page using the full model number, HP Serial Number or Dell Service Tag on sticker. 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.

I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.

Dell wireless adapter not working