Error 0xC1900107 is a common error code that can occur when upgrading your Windows operating system — during the Windows Update process or when upgrading to a new version, such as from Windows 7 or 8 to Windows 10.
The error message typically reads: “The installation failed in the SAFE_OS phase with an error during BOOT operation.” This guide explains what causes it and the steps to fix it.
What Causes Error 0xC1900107?
This error usually indicates an incompatible driver or software installed on your system is preventing the upgrade from completing — often outdated drivers, security software, or third-party applications conflicting with the upgrade process.
Here’s how to fix Error 0xC1900107:
Update your drivers
Make sure all your device drivers are current, including graphics, network, and other peripheral drivers. Visit each manufacturer’s website to download the latest compatible versions. If outdated drivers continue causing upgrade problems, see our guide to Windows Update Error Code 0x8007025D.
Disable or uninstall incompatible software
Temporarily disable or uninstall security software, antivirus programs, or third-party applications that might be conflicting with the upgrade — you can reinstall them afterward. If corrupted Windows files are contributing to the problem, see our guide to Windows Update Error Code 0x800F0900.
Disconnect peripheral devices
Disconnect unnecessary peripherals like printers, scanners, external hard drives, or USB devices before starting the upgrade, since these can sometimes cause compatibility issues.
Run the Windows Update Troubleshooter
Go to Settings → Update & Security → Troubleshoot → Windows Update and follow the instructions to automatically detect and resolve update issues. If it still fails or gets stuck, see our guide to Windows 11 Update Stuck or Not Installing.
Perform a clean boot
A clean boot starts your computer with a minimal set of drivers and startup programs, helping identify whether third-party software is causing the conflict. Follow Microsoft’s official documentation for the exact steps for your Windows version.
Still Not Resolved?
If none of the above steps resolve the issue, our experts are here to assist you — Chat with a specialist — and can provide guidance specific to your system configuration and the exact circumstances of the error.
We are an independent technical support provider and are not affiliated with, endorsed by, or sponsored by Microsoft.
FAQ
What does “failed in the SAFE_OS phase” mean?
It means the upgrade failed during a specific boot-related stage of installation, usually because of an incompatible driver or software conflicting with that process.
What causes Windows Update Error 0xC1900107?
It’s usually caused by an outdated or incompatible driver, security software, or a third-party application conflicting with the upgrade process.
Should I disconnect USB devices before upgrading Windows?
Yes, it’s a good precaution. Disconnecting non-essential peripherals rules out compatibility conflicts that can interfere with the upgrade.
What is a clean boot and when should I use it?
A clean boot starts Windows with only essential drivers and services, helping identify whether a third-party program is conflicting with the upgrade — use it if other fixes haven’t worked.
