Activation of my MS operating systems.

My Lenovo, computer office came with W7, I walking to W8.1, ran into problems, then returned to W7. I can't find the product code. I can't reinstall my W8.1, product code: >, but it bombs on loading over and over again. I would like to install W10, but ask you a W7 product code.  Please help me. What can I do?

I thank "s".

Ewald

The product key should be located on the COA sticker

attached to the bottom of your laptop or in the battery compartment.

You can perform a custom installation using your product key and Windows 10 support:

How to download official Windows 10 ISO files

then

How to: perform a customized Windows installation

review

How to install and activate Windows 10 using your Windows 7 or Windows 8 product key

Tags: Windows

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