How to get OEM windows 7 professional licence key which is not activating automatically?

[DEVANSHU MOHRIYA]

Sir, I have have laptop HP 6460b which come with windows 7 professional, and now when I install windows 7 professional again it is not activating. When I tried to find OEM windows 7 key. It is only showing that Windows 7 OEM Marker present in firmware and I didn't get OEM but When I install windows 10 it automatically digital licenced when there is internet. I didn't buy windows 10 anytime also The back windows sticker is erasedHow please tell how to get OEM windows 7 key Thankyou Devanshu

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