Re: not connected to Internet
The usual reason, if other wireless devices work: no good password key given for the enctrypted connection. Then, when hovering the mouse over the wireless symbol in the task bar you'll see a message about limited connectivity.
http://ask-leo.com/what_is_limited_connectivity_and_how_do_i_fix_it.html tells more about it.
If no luck, please post the full output of ipconfig (from the command prompt, don't forget to press enter) in your answer.
If othter wireless devices don't work either, it's a router issue.