Try opening network connections TCP/IPv4 on your pc and add ip address manualy to be in the same number match the same as your router ie default gateway and preferred DNS Server eg 192.168.1.1 or 10.1.1.1 depending on what default the router is set on the ip address should be the same apart from the last no. eg 192.168.1.8 or 10.1.1.8 subnet mask will default to the right setting if you push the tab key after entering the ip address

Hope this helps