Local area connection doesn't have a valid IP configuration

Hey everyone,

I'm knew to the forum :) First time posting.
So my problem is that we just got a knew ISP like 4-5weeks ago and they gave us the modem and it only has 1 port so we bought a TP-LINK TL-WR841N. It was all good until I got the error massage one morning that no valid IP configuration ( I attach a screenshot of it) and now I can only use Wi-Fi connection but not wired connection since the loss through the rooms are a lot. We have a 100mb/s internet and only 20-30mb/s arrives in my room with Wi-Fi. I tried a lot of things so far but nothing worked. What I know for sure is that my laptop doesn't want to get the IPv4 Default Gateway and DNS server and that is the problem. Hope someone can help me out

Just to make sure I get it right: you are saying that you can connect to the router wireless, but if you plug an Ethernet cable to the back of the router and your computer - it doesn't work?

Would you post the same screenshots as the last two, but with your wireless connection?