OneDrive Error Codes

How to Fix OneDrive Error 0xc000012f and ucrtbase.dll Startup Failure

Phi Hung Vo Oct 10, 2026 870 views

Question details

The user experiences a Windows startup error 0xc000012f related to the ucrtbase.dll file in the OneDrive program folder.

How to Fix OneDrive Error 0xc000012f (ucrtbase.dll) at Startup

Product: Microsoft OneDrive
Device & OS: Windows
Scenario: Starting up the computer or launching the OneDrive application
Observed behavior: Windows displays a 'Bad Image' error code 0xc000012f referencing ucrtbase.dll, which prevents OneDrive from successfully launching at startup.

Before you start

Ensure you have administrator privileges on your Windows PC and a stable internet connection before attempting to reinstall or reset the OneDrive application.

Solution 1Recommended

Reset the OneDrive Desktop App

Resetting OneDrive can resolve sync and startup issues by clearing its cached settings without losing your files.

Open the Run dialog

Press the Windows key + R simultaneously on your keyboard to open the Run dialog box.

Execute the reset command

Type '%localappdata%\Microsoft\OneDrive\onedrive.exe /reset' into the box and press Enter.

Restart OneDrive

Wait a few minutes. If the OneDrive cloud icon does not reappear in the system tray, open the Run dialog again and type '%localappdata%\Microsoft\OneDrive\onedrive.exe' to launch it manually.

Data Safety: Resetting OneDrive does not delete your cloud files or local data; it simply restarts the background sync engine to clear out glitches.

Solution 2

Uninstall and Reinstall OneDrive

If resetting doesn't work and the ucrtbase.dll file is corrupted, completely reinstalling the application will replace the missing or damaged files.

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Frequently Asked Questions

What does error code 0xc000012f mean on Windows?

Error 0xc000012f indicates a 'Bad Image' issue, meaning a program's executable or a supporting DLL file (like ucrtbase.dll) is either corrupted, missing, or not designed to run on your current version of Windows.

Will uninstalling OneDrive delete my locally synced files?

No, uninstalling or resetting the OneDrive app only removes the program files. Your actual documents, photos, and folders will remain safely untouched in your local OneDrive directory and in the cloud.

What is the ucrtbase.dll file used for?

The ucrtbase.dll file is a core component of the Microsoft Visual C++ Redistributable package. It is a critical system file required by many modern applications, including OneDrive, to function and load properly during startup.

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