The wifi problem is always disabled

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http://askubuntu.com – i have ubuntu 12.04. And my problem is that the wifi is disabled. It says that the wifi hardware is disabled and it does not switch on when i switch on the wifi . The control always shows that wifi is switched of. The same computer has windows too and my wifi works just fine in it. can anyone please send me the solution to this problem my email id is [email protected] Please i need my wifi. (HowTos)