No Internet Connection

Hmm... this sounds more of 2 things. Firewall and security. Is this a new unit that you have? If not, i suggest you take a look at the settings of the WAP to ensure you do not have mac authentification on (if it's WEP, you will be asked for the encrypted key, and since you did not mention any of this, i assume it's more of a MAC filter setting, preventing you from connecting to the network).

Alternatively, you might wanna find out if you have the WAP's firewall turned on, preventing you from accessing the network (norton's 360 firewall is a pain in the a**). Also, as a precuationary measure, you might wanna update the latest image of linksys's WAP, to ensure optimal performace. Hope this helped. Thanks.