**How to Fix windowsdefenderapplicationguardcsp.dll Missing Error (Solved)**
**1. What is windowsdefenderapplicationguardcsp.dll?**
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` Windows Defender Application Guard (WDAG) is a feature in Microsoft Windows 10 that isolates applications running in the Internet Explorer browser from the main operating system providing an extra layer of security. `windowsdefenderapplicationguardcsp.dll` is a Dynamic Link Library (DLL) file associated with this feature playing a crucial role in its functionality.
**2. Why is windowsdefenderapplicationguardcsp.dll missing?**
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` The `windowsdefenderapplicationguardcsp.dll` file can go missing due to several reasons such as:
– Malware or Virus Infection: Malicious software may corrupt delete or prevent the loading of this DLL file.
– Accidental Deletion: Users might accidentally delete this file while performing system maintenance tasks.
**3. Step-by-Step Fixes:**
**3.1 Method 1: Reinstall Visual C++ Redistributable**
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` The `windowsdefenderapplicationguardcsp.dll` file is related to Microsoft Visual C++ Redistributable packages. To resolve the missing issue reinstall the respective Visual C++ package. Here’s how:
1. Download the latest version of Microsoft Visual C++ Redistributable from [Microsoft’s official website](https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads).
2. Run the downloaded installation file and follow the prompts to complete the installation process.
3. Restart your computer for the changes to take effect.
**3.2 Method 2: Run SFC /scannow command**
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` The System File Checker (SFC) tool can help in repairing missing or corrupted system files including the `windowsdefenderapplicationguardcsp.dll`. Here’s how to use it:
1. Press Windows key + X and select Command Prompt (Admin) or PowerShell (Admin).
2. Type `sfc /scannow` and press Enter.
3. Wait for the scanning process to complete. This might take several minutes.
4. Restart your computer once the scan is finished.
**3.3 Method 3: Update System Drivers**
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` Outdated drivers could potentially cause compatibility issues leading to missing DLL files. Keeping your system drivers up-to-date can help resolve this problem:
1. Press Windows key + X and select Device Manager.
2. Expand the category containing the problematic device.
3. Right-click on the device and select Update driver.
4. Choose Search automatically for updated driver software to let Windows search for and install the latest driver version.
5. Restart your computer after updating the drivers.
**4. Conclusion**
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` The `windowsdefenderapplicationguardcsp.dll` error in Windows can be frustrating but it’s often resolvable with a few simple steps. By reinstalling Visual C++ Redistributable packages running the SFC /scannow command and updating your system drivers you should be able to fix the `windowsdefenderapplicationguardcsp.dll` missing error in no time. If the issue persists it’s recommended to seek professional help or consult Microsoft Support for further assistance.