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If you're lucky, this also contains the serial number. If you bought it, however, you should have some kind of paper or email record.
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You might find your Windows product key on a sticker attached to your computer. Storage media: Serial numbers are often printed onto the storage disc or product box the software came with.Check whether you have one of the following:
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In that case, your last resort are physical objects or electronic records of the software you bought. Maybe you no longer have access to your system, meaning you can't use any of the solutions above.
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