Windows 10: I cant activate my windows even with the product key, what to do?

Hello,I have been using windows 7 these times. Yesterday I bought a DVD from a store of windows 10 & installed Windows 10 pro OEM Included today from that CD drive. Theres a Product key in my DVD contains 25 letters. It says, Latest update withWindows 10 pro product keyxxxxx-xxxxx-xxxxx-xxxxx-xxxxxwhich is written in my dvd with clear letters.When I write them down for my activation windows, it says We could not activate windowswindows cant activate with this product key. go to setting for more information.Well, the key was written in my DVD/CD. I tried more than 5 times & still cant

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Windows 10 product keys and activation - and the KMS angle

Changing the product key to the generic Windows 10 product key will reset activation to the standard retail channel for activation. It might just activate (if there was a previous digital license for Windows 10 for that computer established with Microsoft). Once Windows 10 is back on the retail activation channel, then more than likely changing the product key to the Windows 8 product key using the same method may work.

 

Activate windows 10 after re-installing (I have lost my product key)

I own a Lenovo T430 laptop. In 2017, I installed Windows 10 using my original Windows 7 product key. Unfortunately, I cannot find that product key anymore. I need to re-install windows 10. Will it be automatically activated after the installation, if I skip the step of asking the product key during the installation?

In my opinion, I believe that my laptop will have a digital entitlement stored on the Microsoft Activation Servers and this will not be a problem. Is that true?

If not, please suggest me a solution or a workaround.

 

Product key

Hi Megan,

A product key is used when activating a software.
To help us determine the appropriate troubleshooting steps that can resolve your concern, we'd like to ask the following questions:

• What product are you trying to activate?
• Are you looking for the product key to activate your Office application?
• Which version of Office are you trying to activate? To check this, you can perform the steps posted on this
  link.
• Are you looking for the product key to activate your Windows?

We look forward to your response.