首先檢查並啟動Windows Update服務(wù)，確保Windows Update、BITS、Cryptographic Services和MSIServer服務(wù)的啟動類型設(shè)置為自動，並手動啟動它們；2. 若服務(wù)無法啟動，則以管理員身份運行命令提示符，停止相關(guān)服務(wù)，重命名SoftwareDistribution和Catroot2文件夾以清除緩存，重新註冊關(guān)鍵DLL組件，再啟動服務(wù)；3. 運行Windows Update疑難解答工具自動檢測和修復(fù)問題；4. 執(zhí)行sfc /scannow和DISM /Online /Cleanup-Image /RestoreHealth命令修復(fù)系統(tǒng)文件；5. 若服務(wù)確實缺失，可嘗試系統(tǒng)還原或使用Media Creation Tool進行修復(fù)安裝；最終確認擁有管理員權(quán)限並避免使用可能禁用服務(wù)的第三方工具，大多數(shù)情況下通過前四步可解決服務(wù)未運行或看似缺失的問題。

If you're seeing an error that says "The Windows Update service is not running or missing" , it usually means the Windows Update component (wuauserv) is either stopped, disabled, or corrupted. This can prevent your system from installing updates, leaving it vulnerable or missing important patches. Here's how to fix it:

? 1. Check and Start the Windows Update Service

Press Windows R , type services.msc , and press Enter .

Look for these services:

• Windows Update
• Background Intelligent Transfer Service (BITS)
• Cryptographic Services
• MSIServer (Windows Installer)

For each:

• Right-click → Properties
• Set Startup type to Automatic
• If the service is not running, click Start
• Click Apply → OK

If you get an error when starting the service (like "Access Denied" or "Service not found"), go to the next steps.

? 2. Re-register Windows Update Components

Open Command Prompt as Administrator :

• Press Windows X → Choose Terminal (Admin) or Command Prompt (Admin)
• Run these commands one by one:

 net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver

Then rename the SoftwareDistribution and Catroot2 folders (to clear corrupted cache):

 ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old

Now re-register the update components:

 regsvr32.exe atl.dll
regsvr32.exe urlmon.dll
regsvr32.exe msxml3.dll
regsvr32.exe msxml6.dll
regsvr32.exe actxprxy.dll
regsvr32.exe softpub.dll
regsvr32.exe wintrust.dll
regsvr32.exe initpki.dll
regsvr32.exe wuapi.dll
regsvr32.exe wuaueng.dll
regsvr32.exe wuaueng1.dll
regsvr32.exe wucltui.dll
regsvr32.exe wups.dll
regsvr32.exe wups2.dll
regsvr32.exe wuweb.dll

Finally, restart the services:

 net start wuauserv
net start cryptSvc
net start bits
net start msiserver

? 3. Run Windows Update Troubleshooter

Go to:

• Settings → System → Troubleshoot → Other troubleshooters
• Run the Windows Update troubleshooter

This built-in tool can detect and fix common service issues automatically.

? 4. Check for System File Corruption

Run System File Checker and DISM :

In Admin Command Prompt:

 sfc /scannow

After it finishes, run:

 DISM /Online /Cleanup-Image /RestoreHealth

These commands repair missing or corrupted system files that might be affecting Windows Update.

? 5. Reinstall Windows Update Service (Last Resort)

If the service is truly missing:

• Use System Restore to revert to a point when updates worked.
• Or perform a repair install of Windows (in-place upgrade) using the Media Creation Tool — this reinstalls Windows without deleting your files.

Final Notes

• Make sure you have admin rights .
• Antivirus or third-party optimization tools may disable services — temporarily disable them to test.
• Some registry cleaners or "PC boosters" can remove critical services — avoid them.

Fixing the Windows Update service usually comes down to resetting components and ensuring services are running. Most cases are resolved with steps 1–4. If nothing works, a repair install is safe and effective.

Basically, it's not usually "missing" — just broken or turned off.

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