How do I update an unauthorized Windows 8.1 as authorized without formatting system?

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how to update unauthorized windows 8.1 as authorized without formatting system?

Hello all,
my friend installed unauthorized windows 8.1 in my lap.
so the system often asked updation. but i dont have key.
so please help me how to resolve this problem without formatting the system.
also i have another problems in lap, which is some keys like[6,7,8,9, *,(, del,end] are not working. if any one know the reason please let me know
thanks in advance
 
Re: how to update unauthorized windows 8.1 as authorized without formatting system?

You would need to purchase a valid license for your Windows 8.1 and then activate it using that license - that is the only method we will recommend.

As for your keys, they could just have dirty contacts - try using an aspirator or a can of compressed air to gently blow off dirt stuck underneath the keys.

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