i'm asking a question for my friend. she's using a d-link wireless router and a centrino notebook. previously, she can online using the wifi. but recently, we format the notebook for a new start. it can scan the network/access point. but when connect, it shows limited connect or no connectivity although we are choosing the correct access point and entering the corret password.

my friends who go to her house also can online through wifi but she cannot.

help plz.