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Resolve Windows activation error codes | Microsoft Docs 

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Top 7 Solutions to Fix Error 0xcf in Windows 10, 8 & 7

  Dec 30,  · I found a post on this forum, it is the same error 0xCF when activating a Wind 7 client against Win KMS server. The following solution is really helpful for this error. 1. Uninstall KMS license Key on host - /upk 2. Install Windows Server R2 KMS license key - /ipk 3. Activate KMS server online: /ato. Feb 03,  · Right-click the command prompt then select run as administrator. 2. In the command prompt type or copy-paste the command below. slmgr /dlv. 3. Send us the result of what it says on the description or product key channel from the pop-up window. For home personal use, we commonly use an OEM or a Retail license. Sep 24,  · The error code 0xCf is most likely to pop up if you’re trying to activate a pirated version of Windows. So, the best way to avoid this issue is to buy a genuine copy of Windows. If you’re encountering this issue on a genuine copy of Windows, then try using a different activation method.