Open to config your router, pleae open up the IP of TP-link router after connecting your PC with the router's output port,
How to Open IP:
go to your Internet browser, type in address bar '192.168.0.100' for tp-link and then provide the username and Pass 'admin' for both,
Then go to the setup and click on the type of connecting provided to you, If you have PTCL connection or any other connection which provides adsl formate then click on Static ip, and provide the following address.
IP address: 192.168.1.2 ( for PTCL) or you can check yours ISP's IP by >> run>>cmd>>ipconfig.
Subnetmask: 255.255.255.0( for all networks)
Default gateway: your routers ip, PTCL is 192.168.1.1
Primary DNS: 192.168.1.1 for PTCL others your routers ip
Leave secondary DNS empty...