220-1102 Software Troubleshooting Practice Question
A user reports that a legacy 32-bit application on a Windows 10 64-bit system displays an error: 'The application has failed to start because its side-by-side configuration is incorrect.' The technician verifies that the application was working previously. What is the most likely cause?
⚠ Common exam trap
Test-takers frequently confuse this error with a general 'application failed to start' message and incorrectly attribute it to registry corruption or a corrupted user profile, rather than recognizing the specific side-by-side configuration error as a dependency issue with Visual C++ Redistributables.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Missing Visual C++ Redistributable
The side-by-side configuration error typically indicates a missing or corrupted Visual C++ Redistributable package. Legacy 32-bit applications often depend on specific versions of these runtime libraries, and if the redistributable is missing or damaged, the application cannot load its required side-by-side assembly, even though it worked previously (e.g., after a Windows update or uninstall of the redistributable).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Corrupted user profile
Why it's wrong here
A corrupted user profile typically causes login failures, profile loading errors, or missing personal files and settings, not a side-by-side configuration error. The Windows Side-by-Side (SxS) loader generates the error when it processes an application manifest during process startup, before per-user profile data is even accessed. If the profile were at fault, you would see different symptoms such as 'The User Profile Service service failed the sign-in' or application data loss, not an activation context failure.
- ✓
Missing Visual C++ Redistributable
Why this is correct
A side-by-side configuration error means the application's manifest specifies a dependent WinSxS assembly (such as a Visual C++ runtime) that is missing, damaged, or not installed. Legacy 32-bit applications often depend on a specific Visual C++ Redistributable package, and without the correct x86 runtime, even if the main executable exists, the SxS loader cannot find the required msvcr*.dll or msvcp*.dll. Reinstalling the appropriate redistributable (e.g., VC++ 2005–2022) precisely fixes the missing assembly dependency, which is why this is the correct answer.
- ✗
Registry corruption
Why it's wrong here
Registry corruption can produce a wide range of errors, but a side-by-side configuration error is specifically thrown by the SxS loader when it cannot locate a referenced assembly file in the WinSxS folder or its lookup paths, not because a registry hive is malformed. Although the registry does contain some SxS registration data, an actual registry corruption would typically manifest as 'cannot find specified module', access violations, or Windows startup failures. The precise SxS error message points to a missing manifest or assembly, not to general registry key damage.
- ✗
Hard drive failure
Why it's wrong here
Hard drive failure usually manifests as read/write errors, file-not-found when the application is launched, slow I/O, or a block screen crash (BSOD), not as a side-by-side configuration error. By the time the SxS loader runs, the necessary files have already been read from disk; the error is an assembly activation failure that occurs after file access and manifest parsing. A healthy drive can still produce this error because the issue is missing or mismatched assembly dependencies, not physical storage corruption.
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User Privacy Considerations
Key term
Windows 10
Windows 10 is a personal computer operating system developed by Microsoft that combines the familiarity of Windows 7 with the modern features of Windows 8, designed to run on a wide range of devices from desktops to tablets.
Key term
Windows
Windows is a family of operating systems developed by Microsoft that manages computer hardware and software, providing a graphical user interface for users to interact with their devices.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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