If you've spent hours struggling with a Windows update that always ends with a "FIRST_BOOT Error" message and error code 0xC1900101 , you're not alone. This error usually appears near the end of the process; the system rolls back and reverts you to the previous version of Windows as if nothing happened…
This type of error is usually accompanied by messages like “Installation failed during the FIRST_BOOT phase with an error during the SYSPREP or MIGRATE_DATA operation .” Behind these technical phrases, there's usually the same problem: compatibility issues with drivers, antivirus software, or other programs that interfere with the update. Let's take a closer look at what this means, why it happens, and what you can do to fix it step by step.
What is the FIRST_BOOT error in Windows and when does it appear?
When you upgrade Windows (for example, from Windows 7 or 8.1 to Windows 10, or between versions of Windows 10 or Windows Server), the system goes through several internal installation phases, such as DOWNLEVEL, SAFE_OS, FIRST_BOOT, and SECOND_BOOT . Each phase prepares a different part of the system, migrates data, and configures the hardware and software.
The message “Installation error in the FIRST_BOOT phase” indicates that the failure occurs right on the first startup of the new system after copying the files and preparing the environment. In other words, Windows has already made significant progress, restarts, tries to boot the new version… and then encounters something that prevents it from continuing.
In many cases, this error is accompanied by a code such as 0xC1900101, 0x30018, 0x3000D, or 0x40017 . Although the suffix changes, the root cause is usually the same: a driver or software that causes the system to crash (blue screen or unexpected restarts) right on the first boot of the new environment.
Microsoft acknowledges that error codes like 0xC1900101 are closely linked to driver, antivirus, or hardware incompatibilities . When the system detects that it cannot complete the installation safely, it automatically reverts to the previous version of Windows to prevent rendering the computer unusable.
Common error codes related to FIRST_BOOT
Within the umbrella of the FIRST_BOOT error, there are several specific codes that frequently appear when upgrading to Windows 10 or Windows Server 2019. Each one indicates a different nuance, but all point to technical problems during key phases of the installation . These are:
- Dress 0xC1900101 - 0x30018The message is usually something like: “Windows 10 could not be installed. We have reverted your PC to the state it was in just before we started installing Windows 10. Installation failed during the FIRST_BOOT phase with an error during the SYSPREP operation.” SYSPREP is the tool that prepares Windows for deployment and customization; if something goes wrong there, the installation is aborted.
- Dress 0xC1900101 – 0x3000D accompanied by the text “Installation failed in the FIRST_BOOT phase with an error during MIGRATE_DATA operation.” This directly points to a problem while Windows attempts migrate data from your previous installation (user files, settings, applications, etc.).
- Code 0xC1900101 – 0x40017This is associated with "Installation error in the SECOND_BOOT phase". In this case, the problem occurs a little later, on the second boot of the installation, but the root cause is usually the same: drivers, antivirus software, or hardware controllers that are incompatible with the new system version.
Although some users try aggressive solutions (such as deleting registry keys or disabling half the system ), it is usually not necessary to go that far: it is enough to remove the conflicting components (antivirus, problematic drivers, USB devices, etc.) until the update can be completed without problems.
Most frequent causes of the FIRST_BOOT error in Windows
Practical experience and Microsoft information agree: the most common cause of a FIRST_BOOT error is a driver or application that isn't fully compatible with the new version of Windows. This component causes a serious failure during the first boot of the updated system. These are the most common causes:
- Third-party antivirus and security suitesThese tools are integrated at a very low level in Windows (controlling network traffic, the file system, memory, etc.), and an old or poorly adapted driver can trigger a blue screen just as the system finishes installing.
- Device drivers. Graphics cards, network adapters, WiFi, storage controllers, fiber HBAs, etc. A very clear example in server environments is that of certain QLogic miniport drivers in Windows Server 2016/2019, which have caused FIRST_BOOT errors and blue screens until they have been updated to later versions (9.2.9.23, 9.3.3.20, 9.4.1.20, 9.4.4.20, etc.).
- “Optimizer” programs, third-party firewalls, cleaning tools, and software that loads at startupMany of these processes start very early in the boot process and can interfere with the final Windows configuration during the FIRST_BOOT phase.
- Hardware or other problems BIOS / UEFIDevices with outdated firmware, motherboards with somewhat delicate boot options, or devices that fail to initialize correctly can complicate things for Windows during the update process, especially on older computers or laptops with very limited BIOS.
Windows repair tools: SFC and DISM
Before delving into drivers and antivirus software, it's worth checking that your current system doesn't have any corrupted files or update components . Windows includes two very useful utilities for this: SFC and DISM.
The first recommended step is to open a command prompt with administrator privileges. You can press Windows + X and choose “Command Prompt (Admin)” or “Windows PowerShell (Admin)” , depending on your version of Windows. Another option is to use the Run dialog box (Windows + R), type “cmd”, and open it with elevated privileges.
Once the console is open, it's recommended to run `sfc /scannow` . This command scans system files and attempts to replace corrupted ones with correct copies stored in the Windows cache. The process may take several minutes, so it's best to let it finish without closing the window or interrupting it.
Once SFC has finished, you can proceed with repairing the Windows image using DISM. The recommended order is to first run DISM.exe /Online /Cleanup-image /Scanhealth to assess the image's health, and then DISM.exe /Online /Cleanup-image /Restorehealth to attempt to correct any detected errors.
Each of these commands can take a while, especially on computers with mechanical hard drives or low processing power. It's important to run them one at a time, wait for them to finish, and restart your computer afterward . This eliminates many system integrity issues before attempting the update again.
Advanced error diagnosis: SetupDiag and installation logs
When basic troubleshooting steps aren't enough, it's very helpful to analyze the logs generated by the update process itself and review the Event Viewer . Microsoft offers a specific tool called SetupDiag.exe that searches and analyzes these logs to tell you, in considerable detail, what went wrong.
SetupDiag can be run directly on the computer that failed to update, or by connecting to the installation directories of a remote computer experiencing the same problem. The tool reviews the log files generated by Windows in the installation folders and produces a summary of the most likely cause of the failure , indicating whether the problem originates from a specific driver, a system component, or a known conflict.
In server scenarios, such as with Windows Server 2019 , SetupDiag has proven particularly useful for locating conflicting QLogic Fibre HBA drivers. In some cases, the report directly identified the installed miniport driver version as the cause of the blue screen error during the update.
Once the problematic driver has been identified, the next step is to visit the manufacturer's website (for example, QLogic or the relevant hardware vendor) and check if a newer version exists that fixes the issue. In the case of QLogic, the changelogs for later versions specified fixes that directly addressed these update errors.
If, after updating the driver, the system continues to exhibit the same problem upon repeating the update, it is advisable to go a step further and also update the BIOS/UEFI and the firmware of the HBA, controller, or device involved . A combination of a new driver and old firmware can continue to cause errors even if the original cause appeared to be resolved.
Finally, it's worth remembering that Windows maintains a driver store in the %WINDIR%\System32\DriverStore folder . Even after installing a new driver, older versions may remain and cause conflicts. Visual explorers and specific tools exist that allow you to clean this store, but you must do so carefully to avoid deleting necessary drivers.
Programs and services that you should disable before updating
A common recommendation in both forums and official documentation is to uninstall or disable any third-party antivirus software before attempting a major Windows update. In many cases, simply pausing protection temporarily isn't enough: the safest approach is to completely uninstall it and reinstall it after the update has finished successfully.
In addition to antivirus software, it's a good idea to review other programs that are deeply integrated into the system, such as additional firewalls, security tools, VPNs with their own drivers, optimizers, and performance suites . Anything that interferes with Windows startup, the kernel, or the network can add noise to the process.
Performing a clean boot of the system also helps . This involves disabling all non-Microsoft services and startup programs, so that the system boots with the fewest possible components running. This reduces the chances of a third-party process interfering with the FIRST_BOOT phase.
On the other hand, it's advisable to disconnect all unnecessary peripherals : printers, scanners, external hard drives, USB hubs, webcams, etc. Leave only the keyboard, mouse, and, if absolutely necessary, the network cable or main Wi-Fi adapter connected. The fewer devices Windows has to initialize during the update, the less likely you are to encounter a problematic driver.
Microsoft also suggests, in some cases, disabling Wi-Fi and using an Ethernet cable connection during the download and installation of important updates. This reduces network interruptions or fluctuations that can corrupt installation files or cause communication errors with update servers.
The key to successfully navigating a FIRST_BOOT error lies in combining diagnostic tools like SFC, DISM, and SetupDiag with a bit of patience to rule out antivirus software, outdated drivers, and conflicting hardware . Taking the time to ensure your system is clean, up-to-date, and has the correct drivers often makes the difference between a failed upgrade and a smooth version transition.