How can I reinstall Windows 10 without product key?

Original title: windows issue

I installed windows 10 once by Microsoft account. After some time my computer got slow & i wanted to uninstall .After my computer stabled i tried to reinstall .But it ask for product key ? i downloaded from Microsoft account for free .How can i able to reinstall window 10 without product key ?

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Answer

Andre Da Costa

Article Author

After upgrading to Windows 10, you cannot use your Windows 7 or Windows 8/8.1 product key.

Click Do this Later.

Verify if you have the November Update installed:

How to verify if you downloaded or installed the Windows 10 November Update

If you do, then all you need to do is change the product key using your Windows 7 or 8 product key:

Click Start > Settings > Update & security > Activation > Change the product key then enter the new product key then click Next to Activate