要解決Windows 10中的“Class not registered”錯(cuò)誤，首先應(yīng)以管理員身份運(yùn)行應(yīng)用程序以排除權(quán)限問(wèn)題；1. 右鍵點(diǎn)擊應(yīng)用選擇“以管理員身份運(yùn)行”，並可在屬性中設(shè)置永久管理員模式；2. 若已知問(wèn)題DLL，通過(guò)管理員命令提示符使用regsvr32重新註冊(cè)，如regsvr32 urlmon.dll，必要時(shí)先regsvr32 /u卸載再註冊(cè)；3. 修復(fù)或重新安裝相關(guān)軟件，尤其是Office或舊版程序，可使用官方工具如SaRA；4. 運(yùn)行sfc /scannow和DISM /Online /Cleanup-Image /RestoreHealth修復(fù)系統(tǒng)文件；5. 確保32位與64位兼容，32位DLL需使用C:\Windows\SysWOW64\regsvr32.exe註冊(cè)；6. 若問(wèn)題普遍，可創(chuàng)建批處理文件批量靜默註冊(cè)常見(jiàn)系統(tǒng)DLL；7. 查看事件查看器中的應(yīng)用日誌，根據(jù)CLSID搜索確定缺失組件並針對(duì)性處理；最終需注意部分組件已棄用，或受殺毒軟件和組策略限制，應(yīng)逐步從簡(jiǎn)單到深入排查，多數(shù)情況可通過(guò)重新註冊(cè)或修復(fù)軟件解決。

The "Class not registered" error in Windows 10 usually appears when an application tries to access a COM (Component Object Model) component that isn't properly registered in the system. This commonly happens with older software, Office applications, web browsers using ActiveX, or tools relying on specific DLLs. Here's how to fix it effectively.

1. Run the Application as Administrator

Sometimes, the error occurs due to insufficient permissions.

• Right-click the application or shortcut.
• Select "Run as administrator" .
• If it works, consider permanently setting it to always run as admin:
  • Right-click the app → Properties → Shortcut tab → Advanced → Check "Run as administrator" .

This doesn't fix registration issues but can bypass permission-related access problems.

2. Re-register the Problematic COM Component

If you know which DLL or OCX file is causing the issue (often mentioned in error logs), re-register it using regsvr32 .

Steps:

1. Press Win X → Command Prompt (Admin) or Windows Terminal (Admin) .
2. Type the following command (replace filename.dll with the actual file):

 regsvr32 filename.dll

Example for common cases:

 regsvr32 urlmon.dll
regsvr32 mshtml.dll
regsvr32 shdocvw.dll
regsvr32 browseui.dll
regsvr32 msxml3.dll

? If you get “DLLRegisterServer failed,” the file might be missing or corrupted.

To unregister first, then re-register:

 regsvr32 /u filename.dll
regsvr32 filename.dll

3. Repair or Reinstall the Affected Software

The missing class might belong to a specific program (eg, Microsoft Office, a legacy app).

• Go to Settings → Apps → Apps & features .
• Find the problematic software → Modify or Repair (if available).
• If repair fails, uninstall and reinstall the software.

For Microsoft Office: Use the Microsoft Support and Recovery Assistant (SaRA) or download the installer from office.com .

4. Run System File Checker (SFC) and DISM

Corrupted system files can cause COM registration issues.

Run SFC:

 sfc /scannow

Wait for completion. If issues are found and fixed, restart your PC.

Then run DISM:

 DISM /Online /Cleanup-Image /RestoreHealth

Restart after both complete.

5. Check 32-bit vs 64-bit Compatibility

COM components are architecture-specific. A 32-bit app may fail on 64-bit Windows if the class is only registered in the wrong context.

• 32-bit DLLs are registered under:
  HKEY_CLASSES_ROOT\WOW6432Node\CLSID\...
• 64-bit DLLs use:
  HKEY_CLASSES_ROOT\CLSID\...

Fix:

• Use the correct version of regsvr32 :
  • 32-bit : C:\Windows\SysWOW64\regsvr32.exe
  • 64-bit : C:\Windows\System32\regsvr32.exe

So to register a 32-bit DLL on 64-bit Windows:

 C:\Windows\SysWOW64\regsvr32.exe filename.dll

6. Re-register All Standard System DLLs (Last Resort)

If multiple apps are failing, batch-re-register common system components.

1. Open Notepad and paste the following:

 regsvr32 /s urlmon.dll
regsvr32 /s mshtml.dll
regsvr32 /s shdocvw.dll
regsvr32 /s browseui.dll
regsvr32 /s msxml3.dll
regsvr32 /s atl.dll
regsvr32 /s actxprxy.dll
regsvr32 /s dispex.dll
regsvr32 /s scrobj.dll
regsvr32 /s scrrun.dll
regsvr32 /s vbscript.dll
regsvr32 /s jscript.dll

2. Save as fix_com.bat , right-click → Run as administrator .

The /s flag suppresses success messages. This may take a minute.

7. Check Event Viewer for Clues

If the error persists:

• Open Event Viewer (eventvwr.msc).
• Go to Windows Logs → Application .
• Look for Error entries related to the app or COM .
• Note the CLSID (a GUID like {ABC123...} ).
• Search online using that CLSID to identify the missing component.

Final Notes

• Some COM components are deprecated (eg, certain ActiveX controls). Modern alternatives may be required.
• Antivirus software can interfere with registration—temporarily disable it if needed.
• On managed systems (work/school), contact IT—some registry edits may be restricted.

Basically, "Class not registered" is fixable in most cases by re-registering the right component or repairing the software. Start simple (run as admin, repair install), then move to deeper fixes if needed.

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