hardwar

When i connect my adapter to my laptop,it normally charging . But after 2 or 2.5 hr it shows not pluged in though adapter is connected. If i shut down my laptop for sometime and again start it and connect adapter same thing occur.what is the acctual problem?

i own a laptop and computer and have a broadband coonection(via adsl2+ modem). i want to use internet on both the computers wirelessly. i want all the details so as to establish the wi fi network at home. plzz tell me the hardwar reqired. my budget is minimal.(the lowest u can think of!)