Not connecting to wifi

Hello, my computer was doing fine this morning, then suddenly the internet gave up on me. everything else worked and connected to the wifi, even my sisters laptop, but mine still did not. i have tried turning it off in on, reseting the router, and all the little tricks. i have tried to go into my network connections on my computer to see if my wifi was not enabled in there but it is. so now i don't know what to do.
if you can please help