Wireless will not connect to the access point.

Hello, my name is ander.
I've been having difficulties connect to the wireless router at home. I used to be able to, but until 4 days ago it stopped letting me. I wondered if it was possibly that my card had run it's time, or some simple problem. So I decided to test if it would connect anywhere else. So I went to a few other places and connected just fine. So I came back, tried again and failed. I suspect that another family member may have denied my computer access considering he is knowledgable with computers. But I don't know for sure. Does anyone have a solution?

PS: I have already tried the basic troubleshooting, and resetting of both computer, adapter And router.