Error 0xC004B100 — Activation server was unable to activate your computer

Error 0xC004B100: Activation Server Was Unable to Activate the Computer

This error occurs in: Windows 10, Windows 11, Windows Server.

Cause

A general MAK activation server error — the server rejected the activation request without providing a specific reason. This may indicate a problem with Microsoft's servers or with the key.

Symptoms

• During activation, the message appears: "The activation server was unable to activate the computer"
• Error code: 0xC004B100
• English version: "The activation server determined that the computer could not be activated"

Step-by-Step Solution

Wait a few minutes and try again. If the error persists, activate by phone or contact Microsoft support.

Solution for Windows Server

1. Open PowerShell as administrator
2. Enter the key:

slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

1. Activate:

slmgr /ato

1. Check the status:

slmgr /xpr

Verification

After performing the steps, check if the activation was successful:

• Windows: Settings → System → Activation → should be "Windows is activated"
• Or: slmgr /xpr in the command line

Still Not Working?

If the above steps did not help:

1. Check the date and time — they must be correct (an incorrect date can block activation)
2. Temporarily disable the antivirus and try again
3. Check the internet connection — online activation requires a connection to Microsoft's servers
4. Contact us:
   • Email: [email protected]
   • Phone: 00 800 121 1654 (toll-free)
   • Help center: pomoc.kluczesoft.pl