Issue: Recently, whenever I boot my PC, a strange error pops up that says “System.xml.Linq.ni.dll is either not designed to run on Windows or it contains an error.” It tells me to reinstall the program but the mentioned app here is MicrosoftSecurityApp.exe.
Solved Answer
In Windows operating systems, dynamic link library (DLL) errors commonly encounter problems. DLL files are essential parts that let various applications share resources and code, which reduces the need for memory and disk space. Nevertheless, issues that impair an application's functioning can result from missing, corrupted, or incompatible DLL files.
One specific error that some people encounter is “System.xml.Linq.ni.dll is either not designed to run on Windows or it contains an error.” This error message typically appears in a pop-up window with “Bad Image – MicrosoftSecurityApp.exe” referenced at the top. It indicates a problem with the System.xml.Linq.ni.dll file, affecting the performance of certain applications or the system itself.
Several factors can cause this error to appear. The most common reasons include:
While reinstalling the application in question (Microsoft Defender) might seem like the first thing you should do, it is not recommended, as it can usually be solved in easier ways.
First of all, you should check whether you have a second version of the app installed from the Microsoft Store and get rid of it, as it often causes conflicts (you should only have one security app installed on your PC).
Another method is to update your Windows operating system, as updates can fix compatibility issues and replace missing or corrupted system files.
If that does not help, running SFC and DISM scans via an elevated Command Prompt is the next step. Additionally, performing a thorough malware scan with reliable antivirus software can identify and remove malicious software that might be causing the error.
Detailed instructions for these solutions are provided below the article. Implementing these steps can help resolve the error and restore your system's functionality.
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Having two instances of Microsoft Defender can cause conflicts and errors. Removing the duplicate app can resolve these issues.
Windows S Mode restricts software installations and may cause compatibility issues. Exiting S Mode allows for more flexibility in managing your system.
System File Checker (SFC) and Deployment Imaging Service and Management Tool (DISM) scan for and repair corrupted system files.
Reregistering the DLL file can resolve issues caused by improper registration.
Malware can corrupt system files, causing errors. A thorough scan can detect and remove malicious software. You can use Microsoft Security Scanner is a free option, as well as the built-in Windows Defender. If you choose the latter, follow these steps:
System Restore can revert your computer to a previous state where the error did not occur.
An in-place upgrade can refresh your Windows installation without affecting your files and applications. Don't worry, you won't lose your personal files. Before proceeding make sure you uninstall a third-party security app and disconnect any unnecessary peripherals such as printers or external drives.
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