My laptop won't connect to my home wireless internet help please?

So last night (and for the past 2 weeks when I started to use the wireless) my laptop connected fine. But last night I was on the internet and I randomly lost connection. When I tried to re-connect it said No internet access and Limited Access. My laptop works when I hardwire it. My D-link is unsecured right now. Any tips on how I can fix this? I don't want to have to hardwire it every time I need the internet, I'm not the only one who uses the internet, that's why I need to be able to connect to wireless.