Windows 10: lost windows 10 product key

my dell desktop was having problems with outlook so i decided to use restore point to turn back my computer till outlook was working.i ran the system restore but it froze recreating the registry. After leaving it 24 hours i eventually turned off the pc.then when i switched on the pc it tried to do automatic repair which did not work.i eventually found a dell repair tool on my computer which got it up and running.the problem i have now is that windows 10 is not activated as it is looking for a product key.windows 10 was pre installed on the machine when i bought it from dell i have no disksI

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Lost Windows Activation Product Key

I recently lost my Windows 10 pro Activation product key and now Microsoft wants me to activate my windows but now i dnt have any product key please suggest me the way i dnt want to lost my all data...

 

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.

 

windows 10 key

Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?