How do I find out my product key of my Windows 10 computer when I accidentally put the wrong one in for activation?'

Question

I have had this computer for a long time and didn't know about activation, and I put in the wrong activation key when I tried it. I don't actually know my product key for my computer, and it is very annoying having the "Activate Windows" words in the bottom right corner of my left screen all the time. Error Code: 0x8007007B

Answer 1

Hi,

Error code 0x8007007B means DNS name does not exist. So you mis-type a KMS client setup key into your existing computer, right?

Is it a domain joined computer or local computer?
Any KMS server has been setup in your environment?

If you are using a local device without any volume activation such as KMS or MAK, we could run command line "slmgr.vbs /upk" as administrator to uninstall the existing product key. Then use "slmgr.vbs /cpky" to clean product key cache in registry. At last, reboot your computer.

After that, we need to have a retail product key to activate your computer. For details, we could refer the following link to activate.

Activate Windows 10

If you have an OEM embeded product key, we could try to run command line "slui.exe 4" to activate it through a call.

Bests,

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