Camera will not start with Microsoft 10 Error 0xA00F429F and 0x8007007F

Windows 11 compatibility is unrelated; on Windows 10, first determine whether the camera fails in every application or only in the Camera app, then apply the matching repair below.

1. Test outside the Camera app

Try the webcam in a browser meeting page, Teams, or Zoom.

• If it works elsewhere: Skip to Camera app repair.
• If it fails everywhere: Continue with the physical-control, permission, and driver checks.
• If the camera is absent from Device Manager: Check the laptop’s camera key or shutter first. Some models use a camera key in the F1–F12 row, sometimes together with Fn.^1^

2. Check Windows 10 camera access

Go to Start → Settings → Privacy → Camera, then verify:

1. Under Allow access to the camera on this device, select Change and turn access on.
2. Turn on Allow apps to access your camera.
3. Enable Camera in the Microsoft Store app list.
4. Turn on Allow desktop apps to access your camera for browsers, Teams, Zoom, and similar programs.^2^

Also check any physical privacy shutter, camera switch, or keyboard camera key.

3. Repair the Camera app

Since reinstalling did not help, use the separate repair controls:

1. Open Start → Settings → Apps → Apps & features.
2. Select Camera → Advanced options.
3. Select Repair, then test Camera.
4. If it still fails, select Reset and test again.

Resetting clears the Camera app’s local settings. Microsoft’s camera guidance identifies app, privacy, antivirus, driver, and Windows Update issues as the supported areas to investigate.^3^

If Get Help offers a Camera troubleshooter on this installation, run it before changing the driver.

4. Roll back or reinstall the camera driver

Even without manual driver changes, Windows Update can install hardware drivers automatically.^4^

1. Right-click Start → Device Manager.
2. Expand Cameras, Imaging devices, and Sound, video and game controllers.
3. Right-click the webcam → Properties → Driver.
4. If Roll Back Driver is available, select it, restart, and test. This is especially relevant if the failure began after an update.
5. Otherwise select Uninstall Device.
6. In Device Manager, select Action → Scan for hardware changes.
7. Restart Windows and test again.

If Windows does not restore a working driver, obtain the Windows 10 camera driver—or another camera-related system package explicitly recommended for that model—from the PC manufacturer’s official support site. Avoid third-party driver-download sites.

Temporarily pausing any antivirus “webcam protection” feature is also a supported diagnostic. Re-enable it immediately after testing.^1^

If only Camera fails and Event Viewer identifies MFCORE.dll

Open Event Viewer → Windows Logs → Application, reproduce the failure, and inspect the new Application Error.

A closely matching report had:

• 0xA00F429F
• 0x8007007F
• Faulting module MFCORE.dll
• Exception 0xc0000005
• Camera still working in Teams, Zoom, and browsers

That report received a moderator-recommended workaround to remove the current Camera package and install an older package.^5^ This is a community/Q&A workaround—not a published Microsoft known-issue fix—and it relies on third-party tools or a third-party Microsoft Store link-generation site. Prefer PC-manufacturer or Microsoft support rather than downloading an unauthenticated older package.

The workaround also suggests disabling automatic Store updates through Group Policy on Pro editions. Avoid leaving that policy enabled: it affects all Store apps and can delay security fixes. If used only to confirm the diagnosis, re-enable automatic updates immediately afterward and update Store apps manually.

The available evidence does not establish why these codes occurred on this PC. The next useful details are the PC make/model, whether the webcam works in another application, the Windows version from winver, the Event Viewer faulting module, and whether “uninstalled and reinstalled” referred to the Camera app or the camera device/driver.

Windows 10’s normal support ended on October 14, 2025, so new fixes may not arrive through the standard Windows 10 update channel.^2^

References

1. Camera doesn't work in Windows
2. Manage app permissions for a camera in Windows
3. Camera doesn't work in Windows | Microsoft Support
4. Update drivers through Device Manager in Windows
5. Windows Camera App crashes immediately with MFCORE.dll 0xc0000005, but webcam works everywhere else - Microsoft Q&A