Have you tried a different cable to the ethernet port on both the PC and the router ? If your ethernet port is built in to the motherboard , is it enabled ? Have you tried a hard reset ? Any lights flashing or not lit on the router ? Sorry , lots of questions !
The 188.8.131.52 IP as an external IP, you need the internal one. Internal IPs usually begin with 192, 172 or 10. Try using "ipconfig /all" instead of just "ipconfig" and see if you get an internal one come up.