What does this ping error mean?

"In layman's terms, it usually is an indicator that you have lost your connection between your PC and router/modem.

WHY

Typically this is due to loss of power at the router/modem/switch. It could also mean that you cannot receive a dynamic IP address because the DHCP server (whether it's a router or server) cannot be reached.

WHAT TO CHECK

I would make sure that your ETHERNET cable in plugged in and that you see a light on the back of your system where you plug the cable in. If you're using WIRELESS, then make sure that you have a strong signal and little to no interference (those darn cordless phones and microwaves)!
Next if you are using your own router between your ISP's modem and your computer, then make sure that you can login to your router and use the built-in PING utility to ensure that you can ping.

If you can, then you may have a mis-configuration on your router, or a bad ethernet cable.
If you can't, then you may want to plug directly into the ISP provided modem and see if you can receive a dynamic IP address and ping from there."