Application Failed To Start- Side-By-Side | Quick Fixes

What Application Failed To Start- Side-By-Side Means

When Windows shows an application failed to start- side-by-side message, it is warning that the program cannot load the exact files it expects. Windows uses a system called side by side, or SxS, to keep multiple versions of shared libraries in a central store and match each program with the version listed in its manifest.

Side by side assemblies live in the WinSxS folder and are described by manifest files that spell out which runtime libraries each program needs. If those manifests point to a runtime that is missing, damaged, or mismatched, the loader gives up and shows the side by side configuration error instead of starting the app.

In plain terms, the app is usually fine, but the shared pieces it depends on are either not installed or not in the expected shape. That is why the same side by side configuration message can appear for games, design tools, browsers, office suites, and many other programs on the same computer.

Typical wording includes lines such as the application has failed to start because its side by side configuration is incorrect and a hint to check the application event log or run the sxstrace tool. That extra detail matters later, since it tells you which Windows component recorded the failure.

Fix Application Failed To Start Side By Side Error In Windows

Quick aim: sort out the most common side by side problems first so you can get the app running again without heavy digging. Work through the steps in order and try the app after each one so you do not spend time on fixes you do not need.

• Restart Windows Once — A single restart clears pending updates and file locks that can block side by side components from loading correctly.
• Try Running As Administrator — Right click the app shortcut, choose Run as administrator, and see whether the configuration error still appears.
• Check Other Apps — Open a few different programs that rely on Visual C++ runtimes, such as games or design tools, and watch for the same side by side configuration message.
• Capture The Exact Error Text — Take a screenshot or copy the full line that mentions side by side configuration so you can match it with event log details later.

If a quick restart and a different account do not change anything, the problem usually sits in shared runtimes or manifests rather than in basic permissions. The next sections move from fast checks to deeper repairs that target those shared pieces.

Quick Checks Before Deep Side By Side Fixes

Quick check: confirm whether the side by side issue is tied to one app or the whole system. This helps you choose between repairing the app, repairing Visual C++ runtimes, or repairing Windows itself.

• Test A Second Program — If only one app throws the side by side configuration error, that app or its private manifest may be damaged.
• Check Windows Update Status — Open Settings > Windows Update and apply pending updates, since some include updated C++ runtimes and SxS fixes.
• Scan For Malware — Run a full scan with Windows Security or your trusted antivirus tool to rule out tampering with system files or manifests.
• Review Recent Installs — Think about new drivers or tools installed just before this kind of side by side error began, since those changes may have removed or replaced shared libraries.

You can also sort events by time in Event Viewer and match them with the moment you tried to launch the app. That way, each side by side error entry in the log lines up with a specific assembly, so you know whether the fault sits in a Visual C++ runtime, a .NET component, or a third party plug in.

If several unrelated programs now fail with a side by side configuration error, treat the problem as a shared runtime or Windows component failure. When the error stays tied to a single program, a clean reinstall of that program often helps more than broad system work.

Reinstall Or Repair Visual C++ Side By Side Components

Most side by side configuration failures trace back to mismatched or missing Microsoft Visual C++ runtime packages. Many desktop programs depend on these packages to provide C and C++ libraries without bundling their own copy, so a broken runtime ripples across many apps.

Deeper fix: repair or reinstall the Visual C++ redistributables that match your Windows version and your apps. You usually need both the x86 and x64 variants for each major year that your software stack uses.

• Open Apps Settings — Go to Settings > Apps > Installed apps (or Programs and Features on older versions) and search for Microsoft Visual C++ entries.
• Repair Existing Packages — For each Visual C++ item, choose Modify and then Repair when available so Windows writes fresh copies of the side by side assemblies.
• Download Missing Versions — Visit the official Microsoft download page for Visual C++ redistributables and grab current versions such as 2012, 2013, and 2015–2022 in both x86 and x64 form.
• Install One Package At A Time — Run each installer, accept the license, and let it finish before starting the next so the SxS store does not receive overlapping writes.

Pay attention to whether the error appears right away or only after a certain feature loads. If an app opens but shows the side by side configuration message when you start a plug in, that plug in might rely on a different runtime year or architecture than the main program.

After repairing or installing the runtimes, restart Windows and launch the problem app again. If the side by side configuration error disappears, the root cause was missing or corrupted C++ assemblies. If the message remains, you may be dealing with damaged Windows files or an app specific manifest problem.

Use Windows Tools To Repair Side By Side Issues

When runtime repairs do not clear the application failed to start side by side problem, the next step is to check core Windows files. SxS assemblies and manifests live under the WinSxS folder and tie directly into system components, so corruption there can break many apps at once.

Deeper fix: run built in repair tools that scan system files and restore original versions where needed. These commands take a while, so keep the device plugged in and avoid heavy tasks while they run.

• Run System File Checker — Open Command Prompt as administrator and run sfc /scannow, then wait for it to reach 100 percent and follow any on screen guidance.
• Use DISM On Modern Windows — On Windows 10 and 11, run DISM /Online /Cleanup-Image /RestoreHealth in an admin Command Prompt to repair the component store that backs side by side assemblies.
• Check Event Viewer — Open Event Viewer, expand Windows Logs, select Application, and filter for SideBySide events to see which assembly or manifest triggered the error.
• Advanced: Use SxSTrace — If you are comfortable with command line tools, use sxstrace.exe to trace one launch of the failing app and read the generated report for the exact missing assembly.

If SFC and DISM both report that they repaired files, keep a copy of the logs in case the problem returns. That file often shows which assemblies changed recently.

System file repairs and component store cleanup often restore the WinSxS folder to a healthy state. That gives the side by side loader a clean set of manifests and libraries to match against each app, which reduces repeat configuration failures.

Reinstall Or Repair The Affected Application Safely

Sometimes the side by side configuration error points at one program that has its own damaged files or configuration, while the global runtimes are fine. In that case a clean reinstall clears broken manifests, private libraries, or mis edited config files that block startup.

Targeted fix: remove the app cleanly, save any needed data, and then install a fresh copy from a trusted source. Avoid registry cleaners or manual file deletion unless the vendor gives clear directions, since those steps can deepen side by side problems.

• Back Up App Data — Export user settings or project files to a safe folder so you can bring them back after the reinstall.
• Uninstall From Settings — Use Settings or Programs and Features to uninstall instead of deleting files by hand, which keeps shared SxS components in place.
• Remove Leftover Folders — After uninstalling, remove only the app specific folders under Program Files and AppData that the vendor says are safe to delete.
• Install The Latest Version — Download a current installer from the vendor site and install it with administrative rights so it can register side by side assemblies correctly.

If a reinstall still leads straight back to the same side by side message, revisit the Event Viewer entries. They may show that the app config file or a plug in library points to a very specific runtime version, which you can then install or repair directly.

Prevent Side By Side Errors Long Term

Once you have cleared the immediate side by side configuration error, a few habits reduce the odds of seeing it again later. The goal is simple: keep shared runtimes consistent and avoid half finished changes to system files or app manifests.

Habit	What It Does	How It Helps Side By Side Stability
Keep Windows Updated	Applies security and reliability patches on a regular schedule.	Refreshes system components, including SxS assemblies and runtimes.
Install Apps From Trusted Sources	Uses official vendor installers instead of unknown repacks.	Reduces the risk of broken manifests or missing runtime entries.
Avoid Forced Shutdowns	Lets Windows finish updates and file writes before power off.	Lowers the chance of corrupted WinSxS files and side by side errors.

Another helpful practice is to create a restore point before large software installs or driver changes. If a new graphics driver or complex suite introduces fresh side by side errors, rolling back to that restore point brings the system files and WinSxS contents back to a known good state.

Simple habit: when you remove old versions of Visual C++ redistributables, pause before deleting every entry with the same year. Many programs still depend on older minor versions, so keeping them in place prevents fresh side by side configuration problems.

Side by side errors feel mysterious at first because the wording does not mention the real cause. Once you know that the application failed to start- side-by-side message points at shared runtimes and manifests, you can follow a clear, repeatable path: confirm the scope, repair Visual C++ packages, run system tools, and refresh or reinstall the affected app.