Windows + R Type in cmd Press Enter Type in "ipconfig /flushdns" Press Enter Type in "ipconfig /release" Press Enter Type in "ipconfig /renew" Press Enter Ping server, check if working. If still doesn't work, disable your local area connection (either via unplugging or by disabling network adapter) to router. Unplug router. Wait 10 seconds. Plug router back in. Enable network adapter again. Attempt to ping a server see if fixed. If still not working, bypass router, plug directly into wall, repeat ipconfig /flush dns and try again. If still not working type in "netsh interface ip set dns "Local Area Connection" static 192.168.0.200" substituting 192.168.0.1 stuff for a new static ip that would fit on your network (usually adjusting the number by 2-3 is fine). Then repeat the release renew and flush dns steps and try again. To revert static ip back to dns assignment use this "netsh interface ip set dns "Local Area Connection" dhcp". If still not working, contact ISP support group. Make sure you don't have any vpns or proxy ip software enabled.