WiFi Connection Problems

It has been two days now since I'm having trouble with my Wifi here at home. It works perfectly fine with my devices except for one, my Macbook Air. It has been hell for me. I have classes online and I can't access it here at home anymore. Everytime I open my macbook air and connects it with my WiFi, one, it won't connect at all, two, it disables my WiFi completely. Am I the only one with this problem? I tried way too many times to reboot my router and computer and still it doesn't work! Annoyingly, it works perfectly fine with some other WiFi spots. This only happens at my router at home. the router I have is Belkin. It works great and I had no problems with it till now. It's ridiculous, really. This computer did so well for a year and now it this happens. I don't know what to do.