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net runtime error 1026 windows 11

Rajanikumar Ravi 20 Reputation points
2026-01-19T11:00:05.2333333+00:00

Hi, Could you please provide a solution for this error?

Windows for business | Windows Client for IT Pros | Devices and deployment | Install Windows updates, features, or roles
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  1. AI answer

    2026-01-19T11:00:13.7766667+00:00

    The error code 1026 typically indicates an issue with the .NET runtime environment. To resolve this error on Windows 11, you can try the following steps:

    1. Repair the .NET Framework: Use the .NET Framework Repair Tool to fix any issues with the .NET Framework installation. You can download it from the Microsoft website.
    2. Install the Latest .NET Framework: Ensure that you have the latest version of the .NET Framework installed. You can check for updates through Windows Update or download it directly from the Microsoft website.
    3. Check for Windows Updates: Make sure your Windows 11 is fully updated, as updates can fix underlying issues that may cause runtime errors.
    4. Reinstall the Application: If the error occurs with a specific application, try uninstalling and then reinstalling the application to ensure all components are correctly installed.
    5. Run the Application in Compatibility Mode: Right-click on the application, go to Properties, and under the Compatibility tab, try running it in compatibility mode for an earlier version of Windows.

    If these steps do not resolve the issue, you may need to look into specific logs or error messages that can provide more insight into the problem.

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  2. Domic Vo 25,430 Reputation points Independent Advisor
    2026-01-19T11:32:13.9033333+00:00

    Hello Rajanikumar Ravi,

    The .NET Runtime Error 1026 in Windows 11 is an event log entry that indicates an application crashed due to an unhandled exception in the .NET Framework or .NET runtime. The error itself is generic; the critical detail is the exception code and the faulting application name, which you can find in Event Viewer > Windows Logs > Application. For example, you may see Exception code c00000fd or System.NullReferenceException. Without that detail, the error only tells you that the runtime terminated a process.

    The most direct fix is to repair or reinstall the .NET runtime. Microsoft provides the .NET Framework Repair Tool, which can automatically detect and fix corruption in the runtime installation. Download it from Microsoft’s official site, run it, and then reboot. If you are running applications that depend on .NET Framework 4.x, confirm that the latest version (currently 4.8.1 on Windows 11) is installed. You can check this in the registry under HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\Release. A value of 534325 corresponds to 4.8.1. If the value is missing or lower, install the latest runtime manually.

    If the error persists, the issue is often with the application itself rather than the runtime. Event ID 1026 is logged whenever an application throws an exception that is not caught. In that case, you need to identify the faulting application in the event log and either update it, reinstall it, or contact the vendor for a patch. For example, antivirus software, third‑party utilities, or even Office add‑ins can trigger this repeatedly.

    Another common cause is a conflict between two third‑party processes. You can test this by performing a clean boot (msconfig > disable all non‑Microsoft services) and then re‑enabling services one by one until the error reappears. If the error disappears in clean boot, you’ve confirmed a third‑party conflict.

    Finally, if the exception code is c00000fd, that indicates a stack overflow. This is not a runtime corruption but a programming error in the application. The only resolution is to update or replace the application.

    In summary, Event ID 1026 is not a Windows bug but a signal that either the .NET runtime is corrupted or an application is failing to handle exceptions. Repair the runtime, confirm the latest version is installed, and then focus on the specific application listed in the event log.

    I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!

    Domic Vo.

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