Reinstall, but can not find the activation code

I had to reinstall Home premium to Windows 7 on my dads computer, but it can not find the activation code it makes when it was sold.

I confirmed that its windows is certainly authentic.

What should I do?

I have 2 days to activate it.

How can I get the activation code?

The product key should be on the COA sticker on the case of the machine - perhaps in the battery compartment, if it's a laptop.

Tags: Windows

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