Unplug your wireless router, and your modem. Wait 1 minute.
Plug the modem back in, wait 1 more minute then plug your wireless router in and wait another minute.
See if your laptop can connect. If it can, great. If not then plug your laptop directly into the wireless router or the modem (either one works but you will have to restart the modem if you plug into that) and see if you can connect.