- Windows 7 Build - Error Code 0xCF when activating - Microsoft Community

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Windows 7 Build When to activate the error 0xCF code appears. - - Method 1: Run the Activation Troubleshooter (Windows 10 Only) 

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Try to Fix Activation Error 0xcf? Here’re 4 Useful Methods.

  Hi, I recently bought an HP laptop with preloaded windows 7 Home premium. I have the Windows 7 Key, entered it, activated, and things were fine. › windows-updates-activation › winpre.