The api-ms-win-crt-runtime-l1-1-0.dll message usually means that an application cannot find or load the Universal C Runtime component it needs. The supported first repair is to install the Microsoft Visual C++ Redistributable that matches the application’s architecture, then complete Windows Update and restart. Do not download the DLL by itself from an unofficial site.
If the redistributable installs successfully but the program still will not start, use the application’s repair or reinstall option. A failed redistributable installation should be diagnosed from Microsoft’s installer logs rather than by repeatedly copying random DLL files.
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What the api-ms-win-crt-runtime-l1-1-0.dll error means
The filename belongs to the Windows Universal C Runtime API set. It is not normally a standalone application file that you should replace manually. A program built with Microsoft C or C++ tools calls runtime functions through this API. Windows or a Visual C++ Redistributable package supplies the underlying runtime files. If the component is missing, damaged, unavailable to the application, or not serviced correctly, Windows can display messages such as "The program can’t start because api-ms-win-crt-runtime-l1-1-0.dll is missing from your computer."
Microsoft describes a Visual C++ Redistributable as software that installs Microsoft C and C++ Runtime libraries. The package must match the application’s target architecture; the architecture of Windows itself is not enough to choose a download. A 32-bit program running on 64-bit Windows can still require the x86 package.
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On older Windows installations, the Universal C Runtime may also arrive through Windows servicing. Adobe identifies a failed installation of Windows update KB2999226, which contains the Universal C Runtime, as a likely cause of this message in Substance 3D Painter. That does not mean every occurrence is caused by that update, but it makes Windows Update an important part of the repair.
Check these details before changing anything
- Write down the exact application name and the complete error text.
- Determine whether the affected application is x86, x64, or ARM64 from its vendor documentation, installer package, or system requirements. Do not infer the answer solely from whether Windows is 64-bit.
- Record your Windows edition and version. This information helps explain servicing or compatibility failures when you contact the application vendor.
- Close the affected program and any installer that may still be running. If Windows has a restart pending, save your work before continuing.
The architecture decision is the most common point of failure. Use this guide when selecting the package:
| Application architecture | Package to install | Important qualification |
|---|---|---|
| x86 (32-bit) | Visual C++ Redistributable x86 | Required by a 32-bit application even when the operating system is 64-bit. |
| x64 (64-bit) | Visual C++ Redistributable x64 | Use the package that matches the application’s target architecture. |
| ARM64 | Visual C++ Redistributable ARM64 | Choose this only when the application documentation identifies an ARM64 build. |
The generation of Visual C++ required by the application also matters. Microsoft’s supported-downloads guidance notes that an application may require a redistributable at least as recent as the build tools used to create it. If the vendor specifies a particular generation, follow that requirement instead of assuming that any older package is interchangeable.
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Install the correct Microsoft Visual C++ Redistributable
- Open Microsoft’s current supported Visual C++ Redistributable download page. Use Microsoft’s official package, not a DLL-hosting site or a repackaged installer.
- Select the architecture identified for the application. If the program is 32-bit, select x86; if it is 64-bit, select x64; use ARM64 only for an ARM64 application. When a vendor explicitly requires more than one architecture, install each required package.
- Run the installer with the affected application closed. Accept the license terms and allow the setup program to make changes. If it offers Repair because the package is already present, choose Repair rather than removing files manually.
- Wait for setup to finish and note the result. Keep the installer’s error code or message if it reports a failure. That information is more useful than the DLL filename alone.
- Restart Windows if setup requests it. A restart can complete pending component registration and servicing operations.
Do not place the downloaded redistributable in the application folder as if it were a replacement DLL. The redistributable installs the related runtime components together and maintains them through the supported Windows installation process.
Complete Windows Update, including pending servicing
Windows Update can supply or repair Universal C Runtime components, particularly on older Windows versions. Even when the Visual C++ installer appears to be the direct fix, pending servicing can prevent it from completing correctly.
- Open Settings and go to Windows Update (on older Windows versions, open the Windows Update control panel).
- Select Check for updates and install all applicable updates offered for your Windows version.
- Restart whenever Windows requests it. After the restart, return to Windows Update and check again until no required restart or pending update remains.
- Run the Visual C++ Redistributable installer again if it previously failed, then restart once more if requested.
KB2999226 is specifically associated with the Universal C Runtime on some older Windows installations. You do not need to search for a loose copy of that update first; use the normal Windows Update servicing path and the current supported redistributable. If your edition or servicing channel does not offer that update, follow the package and Windows-version requirements shown by Microsoft and the application vendor.
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Launch the application and repair it if necessary
After the redistributable and Windows updates complete, start the affected application normally. If the same message appears, the runtime may now be present but the application’s own files, installer state, or dependency registration may be damaged.
- Open Settings > Apps > Installed apps (or Apps & features on older Windows).
- Select the affected application and choose its available Repair option. Some vendors provide a separate repair command in the application’s installer or Start-menu folder.
- Restart Windows and test the program again.
- If repair is unavailable or does not help, uninstall the application, restart, and install a fresh copy from the vendor. Keep the vendor’s architecture and Windows-version requirements in view.
Autodesk’s support guidance for this exact message recommends reinstalling the Microsoft Visual C++ Redistributables. That is a valid next step when an application repair alone does not restore the dependency. Reinstall the matching package from Microsoft rather than replacing an individual file.
What to do when the redistributable installer fails
Repeatedly launching a failed installer rarely changes the underlying condition. Microsoft’s troubleshooting guidance recommends installing the latest redistributable first, then collecting Visual Studio and .NET setup logs so the error can be identified.
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Capture the installer details
- Record the installer’s complete error message or numeric code.
- Record the Windows version, application name, and application architecture.
- Note whether Windows Update showed a pending restart or failed update.
- Keep the exact time of the failed attempt; it helps locate the corresponding log.
Find the VC Redist logs
The relevant files use the naming pattern dd_vcredist_<arch>_yyyyMMddHHmmss, where <arch> identifies the package architecture and the final section records the date and time. Open the log for the failed attempt and search for entries containing Error or Failed. Microsoft’s troubleshooting guide lists common-error remedies after these entries are identified.
Do not delete the logs before support has reviewed them. If a vendor asks for setup evidence, provide the installer code, the matching log, your Windows version, and the architecture you selected. This avoids a common support loop in which the wrong package is tried repeatedly without documenting the result.
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Use the symptom to choose the next branch
| Observed result | Likely next action | Reason |
|---|---|---|
| The installer says the package is already installed, but the application still reports the DLL error. | Use the installer’s Repair option, restart, then repair or reinstall the application. | The runtime registration may be damaged, or the application files may be incomplete. |
| The installer fails before completing. | Finish Windows Update, restart, retry, and inspect the dd_vcredist_... log if it fails again. |
Pending servicing or a setup prerequisite can block installation. |
| The application is 32-bit on 64-bit Windows. | Install the x86 package, regardless of the operating system’s 64-bit label. | The redistributable architecture must match the application. |
| The runtime installs, but only one application still fails. | Run that application’s repair or reinstall process and consult its vendor requirements. | A program-specific file or dependency may be damaged. |
| The error returns after a major Windows change. | Check Windows Update again, reinstall the supported redistributable, and test the vendor’s current application build. | Servicing changes can affect runtime availability and application compatibility. |
Why downloading a single DLL is the wrong fix
Unofficial DLL download sites distribute files without guaranteeing that the file belongs to the correct runtime build, architecture, or security context. Copying one file into System32 can create a version mismatch while leaving the other runtime components absent. It can also make later diagnosis harder because Windows no longer reflects a clean redistributable installation.
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Use Microsoft’s redistributable or Windows servicing package instead. If the application remains broken after the supported runtime is repaired, use the vendor’s repair or reinstall process. This keeps the runtime, its related libraries, and the application’s own files on supportable installation paths.
Verify the repair without changing system files manually
- Restart Windows after the final installer or update operation.
- Open the application from its normal shortcut rather than launching a copied executable from a temporary folder.
- Confirm that the original error no longer appears and that the application reaches its normal sign-in or project screen.
- If another runtime message appears, record its exact filename; do not assume it is the same dependency.
- If the program still fails, send the vendor the application version, Windows version, architecture, redistributable result, and any relevant setup-log error.
A successful installation does not guarantee that every crash or startup problem is solved. The redistributable addresses the C runtime dependency; it does not repair unrelated application data, incompatible plug-ins, damaged user profiles, or other missing prerequisites.
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