laptops see wifi but does not connect to internet

Hi I have quite a few devices that use my wifi video game systems , iphone , kindle and mac laptops and they all connect to my wifi with no problem. there are two windows 7 laptops that have norton antivirus on them one version 2009 and another 2011. The laptop with 2009 connected fine with no problems until I ran the live updates and now does not connect the laptop with the 2011 is new and has never connected . I am using earthlink dsl with a linksys router d110 using wpa/tsk security. Seems like there is a problem with the norton settings.  Any help would be greatly appreciated .

PS I also have a year old Dell desktop with a wired connection through the router with norton 2011 now and have no problems connecting to the internet.

 

Thanks again.  Rob