Have any other networks to test connect to? If it will connect to others the issue is likely with the specific connection profile or the router.
Power cycle the router (off for 30 seconds) and uninstall the wireless adapter driver, then reinstall it and try again.
Assuming of course you haven't tried these steps already.
Yes. I have 4 laptops on it. I brought a friends home with me because it wouldn't connect to his wireless and I can't get it to connect to mine either. I need to plug it in wired and see if it gets an IP.