220-1102 Software Troubleshooting Practice Question
After a Windows update, a user reports that a 32-bit application displays a 'DLL not found' error for a DLL that the technician confirms is present in C:\Windows\System32. What is the most likely cause?
⚠ Common exam trap
Many exam-takers assume 'System32' always contains the correct DLL for all applications, not realizing that on 64-bit Windows, System32 is reserved for 64-bit code and 32-bit applications are transparently redirected to SysWOW64.
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
✓
The 32-bit application is looking for the DLL in the SysWOW64 folder, but it is located in System32
On 64-bit versions of Windows, the System32 folder is reserved for 64-bit DLLs, while 32-bit DLLs are stored in SysWOW64. When a 32-bit application attempts to load a DLL from C:\Windows\System32, the File System Redirector transparently redirects the request to C:\Windows\SysWOW64. If the required DLL is only present in System32 (the 64-bit location) and not in SysWOW64, the 32-bit application will fail with a 'DLL not found' error, even though the DLL exists in the path it requested.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The 32-bit application is looking for the DLL in the SysWOW64 folder, but it is located in System32
Why this is correct
WOW64's file-system redirection transparently maps 32-bit application requests to the SysWOW64 folder, so a 32-bit process attempting to load a DLL from Windows\System32 is actually redirected to Windows\SysWOW64. The DLL the technician found is physically in the 64-bit System32 folder, which the 32-bit app never searches in this context. Even if the DLL is compatible, the app will still report 'DLL not found' because the redirection makes the System32 path inaccessible to it.
- ✗
The DLL is corrupted due to the update
Why it's wrong here
A corrupted DLL typically produces errors like 'bad image' or 'not a valid Win32 application,' not a simple 'DLL not found' message. The technician verified the DLL exists and is accessible, and there is no indication of file-integrity failure. The reported error is explicitly about the folder path being wrong, which points to a location mismatch rather than bit-level file corruption.
- ✗
The application needs to be reinstalled after the update
Why it's wrong here
Reinstalling the application copies its own DLLs to its installation directory or to SysWOW64 if the installer is 32-bit, but it will not automatically move a DLL that was manually placed in System32. Because the root cause is that the application is searching SysWOW64 while the DLL resides in the 64-bit folder, reinstallation would only help if the installer deliberately overwrites that wrong location. The update did not break the application's installation integrity here, so a reinstall is an unnecessary reactive step rather than the precise fix.
- ✗
The DLL was quarantined by antivirus software
Why it's wrong here
Antivirus quarantine removes the file from its original path or locks it with an ACL, and the technician confirmed the DLL is still present and accessible, so quarantine does not match the observed facts. A quarantined DLL typically triggers a 'missing dependency' error on every launch until restored, but this issue specifically names the SysWOW64/System32 path mismatch. Additionally, quarantine would not explain why the application is looking in a different system folder after a Windows update.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1102 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1102 exam.