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Windows runtime troubleshooting
Runtime Error Troubleshooting Guide
Identify the component behind a runtime failure, restore trusted dependencies, and repair the affected application without downloading random replacement files.
Windows 10 & 11Practical repair guideUpdated September 2026
HOW TO REPAIR WINDOWS RUNTIME ERRORSChoose the runtime repair method that works for you
Restore trusted application dependencies yourself, or use Advanced PC Repairs when Windows can still start and you want help identifying supported system conditions.
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Manual repair
Repair the affected runtime safely
- Capture the exact messageRecord the application, runtime name, file, and error code.
- Identify the ownerDetermine whether Visual C++, .NET, DirectX, or the application supplies it.
- Repair the trusted sourceUpdate or repair the application and its official prerequisites.
- Check Windows if widespreadUse DISM and SFC when many unrelated applications fail.
View the complete manual runtime steps ›✓
Automatic-assisted option
Scan with Advanced PC Repairs
Scan for supported Windows conditions that may contribute to runtime failures, damaged components, or system instability.
- Guided scan with a clear results summary
- Helps identify supported repair opportunities
- You review the results before choosing what to do
Start a Free PC Scan ›Requires Windows to start and software to be installed. Scanning is free. Optional paid repairs or subscription plans, including pricing and renewal terms, are shown before purchase.A runtime error occurs after an application starts or attempts to perform a task. The message may name Microsoft Visual C++, .NET, DirectX, a DLL, or only the affected program. The safest repair begins by identifying which component owns the failure.
Safe starting point: Record the complete error message and the action that triggered it. Restart Windows once, install pending updates, and test again before changing system components.
What a runtime error means
Applications rely on shared components to run. A failure can appear when the program calls a missing, damaged, blocked, or incompatible dependency. The error does not automatically mean Windows itself is broken.
| Message or symptom | Likely area | Best first action |
|---|
| VCRUNTIME, MSVCP, or Microsoft Visual C++ error | Visual C++ Redistributable | Repair the app, then repair or install its official x86/x64 Visual C++ prerequisites. |
| .NET Framework, CLR, or unhandled exception | .NET or application code | Update the app and Windows; enable or repair the required supported .NET component. |
| Side-by-side configuration is incorrect | Application manifest or Visual C++ assembly | Repair or reinstall the application and its documented runtime package. |
| DirectX, D3D, XAudio, or game launch error | Graphics/audio runtime or driver | Verify game files, install official prerequisites, and update the GPU driver safely. |
| Runtime error affects only one program | Application files or plug-ins | Repair or reinstall that program and remove recently added extensions or mods. |
| Many unrelated applications fail | Windows servicing or hardware stability | Run DISM and SFC, then check updates, storage, memory, and security history. |
Identify the runtime owner
- Capture the exact message.Note the application, runtime name, file, error code, and action that caused the failure.
- Confirm the scope.Determine whether one app, several apps, games, or Windows components are affected.
- Review recent changes.Check recent app, plug-in, driver, Windows, security, or game updates.
- Check Reliability Monitor.Look for the faulting application and module at the time of the crash.
Safe repair order
- Update the affected application.Use its built-in updater, Microsoft Store, or original publisher.
- Repair the application.Use Installed apps → Advanced options or the publisher's installer when available.
- Restore official prerequisites.Install only the supported runtime packages documented by Microsoft or the software publisher.
- Repair Windows components.For widespread failures, run DISM /Online /Cleanup-Image /RestoreHealth and then sfc /scannow from an elevated terminal.
- Reinstall only if needed.Back up settings or projects, uninstall the affected application, restart, and reinstall from its official source.
Avoid “runtime fixer” and standalone DLL downloads. A matching filename can still be the wrong version, architecture, language, or an unsafe file. Restore dependencies through Windows, Microsoft, or the original application publisher.
Repair Visual C++ runtime failures
Visual C++ Redistributables are installed side by side because different applications require different supported versions and architectures.
- In Installed apps, locate the relevant Microsoft Visual C++ Redistributable and choose Modify → Repair when supported.
- On 64-bit Windows, a 32-bit program may still require the x86 package; do not assume x64 alone is sufficient.
- Do not remove older supported packages merely because a newer one is present.
- Download redistributables only from Microsoft or use the prerequisite installer supplied with the application.
- Restart Windows and retest the same action after installation.
Repair .NET failures
- Install pending Windows updates and restart.
- Update the affected application to a version supported by your Windows release.
- Use Windows Features only when the application specifically requires an optional .NET Framework component.
- For modern .NET desktop applications, repair or reinstall the runtime version specified by the publisher.
- If the exception persists in only one program, contact its publisher with the complete error and Reliability Monitor details.
Fix side-by-side configuration errors
Side-by-side errors usually indicate that an application's manifest requests a Visual C++ assembly that Windows cannot load. Repair the application first, then reinstall its documented Visual C++ dependency. Event Viewer under Windows Logs → Application can provide the failing assembly name. Advanced users can use the built-in sxstrace tool for diagnosis; it does not repair files by itself.
DirectX and game runtime errors
- Verify the game or application's files in its official launcher.
- Run the DirectX and Visual C++ prerequisite installers included by the publisher.
- Install current Windows updates and a compatible graphics driver from Windows Update or the device manufacturer.
- Disable recently added overlays, injectors, plug-ins, and mods for a clean test.
- Do not replace DirectX DLLs manually in System32, SysWOW64, or the application folder.
When failures affect many applications
Back up important files, then repair the Windows component store with DISM followed by SFC. Review Windows Security protection history, recent update failures, free storage, disk health, and memory stability. Repeated corruption after repair can indicate a storage, RAM, heat, power, or malware problem rather than a missing runtime.
Prevent recurring runtime errors
- Keep Windows and supported applications updated.
- Install software, runtimes, and drivers only from Microsoft or the original publisher.
- Avoid registry cleaners, dependency bundles, and DLL download sites.
- Create backups before major application, driver, or Windows changes.
- Investigate repeated crashes instead of repeatedly replacing individual files.
Frequently asked questions
Can I fix every runtime error by reinstalling Visual C++?
No. Runtime errors can originate in .NET, DirectX, application code, plug-ins, drivers, Windows files, or hardware instability. Use the exact message and affected scope to choose the repair.
Should I install both x86 and x64 Visual C++ packages?
Often yes on 64-bit Windows. A 32-bit application requires x86 components, while a 64-bit application requires x64 components.
Will SFC repair an application runtime?
SFC repairs protected Windows system files. It normally does not replace third-party application files or every Visual C++ and .NET component.
When should I contact the software publisher?
Contact the publisher when only its application fails after repair and reinstall, or when the message points to the program's own module or code.
Trusted references