Trouble with connecting to internet?!

Yesterday I was playing a game and suddenly my internet was gone so I went to check it, I was disconnected from my router (it's TP-LINK btw). I tried to connect to it again, but with no succes. It says that it has excellent signal, but when I try to connect to it, it will take a long time and finally it says can't connect. It's a very weird problem since my iPad and iPhone and all my other family members' devices can connect to it. It's only been one day and it has already driven me crazy! Please Help?
Added (1). And I forget to mention, We have 3 Routers in our home, I'm using my internet from above which has bad signal.

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