You may have a device enabled in the VPN settings. A disabled device looks like the bottom left picture. An enabled device will appear colour with a check box. Make sure you disable all the devices on the VPN pages. You may not be connected to a VPN but if a device is selected it can cause and issue with pinging.
If you are still experiencing issues, try these solutions:
Disable Adblock on your web browser.
Disable your PC's firewall.
Disable your PC's antivirus.