How to get back to original OS [Closed]

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My laptop (Sony, Vaio) had Windows 8.1 version while buying. Later I chose to format it and install windows 7 ( which lasted for 30 days only). Now I would like to install or go back to original version which I had before but I do not have any product key for Window 8.1. The windows 7, I installed is just trial version. How can I get the product key for my computer or get back to original version of the laptop. Thank you Kindly.
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Hi

Were you provided with recovery CD or installation disks?
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no. I am not. Actually, this is my brother's laptop and I brought it from USA when I was there last year. He does not have anything related to this laptop. So I just have this laptop.
If I install windows 8.1, will this computer automatically get product key associated with this laptop from bios utility?
p
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9,503 >
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No, it will not!

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