Something here may help.
https://support.microsoft.com/en-us/help/10751/windows-why-cant-activate
--please don't forget to Accept as answer if the reply is helpful--
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I have my Laptop bills and window was given by Sony Vaio E-Seies (SVE151B11W) (SVE15125CNB). So is there any possible way to recover same Original window, as I don't have Product key for this.
Please revert me asap.
Something here may help.
https://support.microsoft.com/en-us/help/10751/windows-why-cant-activate
--please don't forget to Accept as answer if the reply is helpful--
Hello,
From your query it seems you want to restore Windows 8. For that, if you're on Windows 10 currently, you can reset to default factory settings.
Feel free to correct me, if I misunderstood your query.
Hello,
You can reset the laptop to the default factory settings.
You can check the following link:
https://helpguide.sony.net/ammig/SVT1121_series/EN/contents/TP0000209782.html
Please click on "Accept as answer" if the reply is helpful.
Thank you,
Hi,
Just checking in to see if the information provided was helpful.
if yes, you may mark useful reply as answer, if not, welcome to feedback.
Best regards,
Molly