Does any one know why my laptop cant connect to the interent?

I have wireless internent, and everything worked fine. Then all the sudden my laptop cant connect to the interent. I have tried going to network and puting it to my home interent, but it says unable to connect. Every other computer in my house is able to connect to the internent. Is it the network or is my there something wrong with the laptop. It is fairly new and worked great, it still does it just wont connect to the interenet. Has this happened to anyone before? Does anyone know how I can fix this? Or why it wont conncect?