Originally Posted by
harihar akhil If your laptop did come with windows 8.1 pro installed then your license key may be embedded in to bios with which windows 10 activates itself.
Second you can try resetting your pc from settings in update section to make it a fresh factory install in your system.My dell didn't ask for any product key after every reset hope it would be the same with you.
thanks,
but when I try to refresh the windows I got an error so i wanted to format it.,
hope the license is there, I have Asus laptop came with windows 8.1 home but I updated the license to windows 8.1 pro before going with windows 10