DNS not responding

My son has a laptop that is running Windows 8

When he tries to get on the internet using WI-FI he gets the message "DNS not responding"...he can get on the internet using a wire connection.

It is the same in all Browsers.. He has deleted and reinstalled his browsers.

We have two other lap tops that use the WI-FI so I don't think there is anything wrong with the modem.

If he does a system restore then he can use the WI-FI until he shuts the lid (his laptop goes to sleep) then when it wakes up it is back to "DNS not responding"

Any help Please
 
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