I got a new motherboard and now my windows isnt activated, i have lost my product key

[Joka7576]

I just got a new motherboard today and installed it, when i turned on my pc it has the activate windows watermark and when i run the troubleshooter does nothing, i lost my product key as i purchased it from ebay sometime ago, is there anyway i can fix this or do i have to re buy windows?

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