How to Fix Fix Error 0x80040155 — Interface Not Registered (COM Error) on Windows
Getting error 0x80040155 "Interface not registered"? COM component errors in Windows apps, print dialogs, or system operations? Fix this COM registration error.
📖
Main Troubleshooting Guide
How to Fix Microsoft Store Not Working →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Error 0x80040155 when opening applications
- •"Interface not registered" in print dialog or file save dialog
- •COM-dependent apps crash with this error on startup
- •Windows Photo Viewer or legacy apps show 0x80040155
- •Error when trying to use OLE/COM automation features
- •Outlook or Office apps encounter this during add-in loading
Common Causes
- ⚠COM component DLL not properly registered
- ⚠Windows component store has missing COM registrations
- ⚠Corrupted registry entries for COM interfaces
- ⚠Application installed incorrectly or partially removed
- ⚠.NET Framework or Visual C++ runtime corrupted
- ⚠Windows Update changed COM registrations
Solutions
Solution 1: Re-register COM Components
- 1CMD as Admin:
- 2regsvr32 /s oleaut32.dll
- 3regsvr32 /s ole32.dll
- 4regsvr32 /s shell32.dll
- 5regsvr32 /s wuapi.dll
- 6regsvr32 /s msxml3.dll
- 7These are the most commonly unregistered COM DLLs
- 8If error mentions a specific DLL: regsvr32 /s [dllname].dll
Solution 2: Repair System Files
- 1CMD as Admin:
- 2sfc /scannow
- 3If issues found: DISM /Online /Cleanup-Image /RestoreHealth
- 4Then re-run: sfc /scannow
- 5Restart PC after repair
- 6For .NET related errors: repair .NET Framework:
- 7Download .NET Framework Repair Tool from Microsoft
- 8Run repair tool → follow prompts → restart
Solution 3: Fix Application-Specific COM Errors
- 1If error occurs with a specific application:
- 2Repair the application: Settings → Apps → find the app → Modify/Repair
- 3Or uninstall completely → reinstall fresh
- 4For Office: run Office Online Repair
- 5Control Panel → Programs → Microsoft Office → Change → Online Repair
- 6For Visual C++ redistributable issues:
- 7Uninstall all Visual C++ redistributables → reinstall latest versions
- 8Download from Microsoft: Visual C++ Redistributable packages (2015-2022)
FIXES THIS IN 5 MINUTES
Fix Fix Error 0x80040155 — Interface Not Registered (COM Error) Automatically
RescuePC Toolkit includes 109+ automated repairs that fix this problem with one click. No command line knowledge required.
Download Now - Free TrialNo credit card required • Works on Windows 10 & 11