Here are some basic troubleshooting steps:

• Try restarting your modem, router, network and computer first.
• Check that connections aren't loose, such as antennas or Ethernet cables.
• Test different cables with all ports on the router/modem
• Use a reputable malware/virus scanning application and attempt a full system scan with all scanning options enabled before continuing on to the next step

Next Steps

• Try removing any saved connections from your list of known networks: http://www.thewindowsclub.com/forget-wireless-network-profiles-windows-10
• If you're still having issues please copy and run the following commands in an elevated (Administrator) command prompt. If prompted to, restart after running each command
  ipconfig /release
  ipconfig /renew
  ipconfig /flushdns
  ipconfig /registerdns
  netsh winsock reset
• If running these commands does not resolve the issue, check your time/date settings to make sure they are up to date.
• The last thing to try is reinstalling your network/Wi-Fi drivers.