FIX: Windows 8 activation fails with error 0x8007007B

I recently encountered the following error when attempting to activate Windows 8. In my case, I knew the issue was due to a missing product key. Below is the workaround.

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1. Press the Windows+R keys, and you’ll got the Run dialog box OR open the Command Prompt with administrative privileges.

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2. Type slui 3, which will open the Windows Activation interface.

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3. Enter your product key and click Activate.

Additional Resources

Windows 8 Tutorials Master Index

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