Hi there I found a solution for you hope this works, please try the following. If not you can try and to a hard reset on your router which will then obain a new ip address from there.
Option 1
Right click on "Network" then click properties, click change adapter settings, right click on your Local Area connection. Uncheck "Internet Protocol Version 6 TCP/IPv6"hit Okay. Then go to IPv4 hit properties, make sure Obtain IP address automatically is selected and obtain DNS automatically.
Option 2
http://www.makeuseof.com/tag/7-simple-steps-diagnose-network-problem/ here is a link to help you further to figure out the problem.
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