What are security.dll Error Messages?

Dynamic Link Library security.dll Errors

security.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like security.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. Xilisoft Video Converter Ultimate) could share the same security.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when security.dll is attempted to be loaded either when Xilisoft Video Converter Ultimate is starting up, or in some cases already running. Some of the most common security.dll errors include:

• Access Violation at address - security.dll.
• security.dll could not be found.
• Cannot find C:\Program Files (x86)\Xilisoft\Video Converter Ultimate\Real\Common\security.dll.
• Cannot register security.dll.
• Cannot start Xilisoft Video Converter Ultimate. A required component is missing: security.dll. Please install Xilisoft Video Converter Ultimate again.
• Failed to load security.dll.
• The application has failed to start because security.dll was not found.
• The file security.dll is missing or corrupt.
• This application failed to start because security.dll was not found. Re-installing the application may fix this problem.

Your security.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Xilisoft Video Converter Ultimate), or deleted by a malware infection. Furthermore, security.dll file corruption could be caused from a power outage when loading Xilisoft Video Converter Ultimate, system crash while loading security.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

How to Fix security.dll Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your security.dll issue. These troubleshooting steps are listed in the recommended order of execution.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

1. Hit the Windows Start button
2. When you see the search box, type "System Restore" and press "ENTER".
3. In the search results, find and click System Restore.
4. Please enter the administrator password (if applicable / prompted).
5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
6. Restore your computer to that backup image.

If the Step 1 fails to resolve the security.dll error, please proceed to the Step 2 below.

You can uninstall Xilisoft Video Converter Ultimate software by following these instructions (Windows XP, Vista, 7, 8, and 10):

1. Hit the Windows Start button
2. In the search box, type "Uninstall" and press "ENTER".
3. In the search results, find and click "Add or Remove Programs"
4. Find the entry for Xilisoft Video Converter Ultimate 7.8.23.20180925 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Xilisoft Video Converter Ultimate software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Xilisoft Video Converter Ultimate 7.8.23.20180925

Xilisoft Corporation

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many security.dll error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

1. Hit the Windows Start button
2. In the search box, type "Update" and press "ENTER".
3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
4. If updates are available for download, click "Install Updates".
5. After the update is completed, restart your PC.

If Windows Update failed to resolve the security.dll error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

If Those Steps Fail: Download and Replace Your security.dll File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate security.dll file version. We maintain a comprehensive database of 100% malware-free security.dll files for every applicable version of Xilisoft Video Converter Ultimate. Please follow the steps below to download and properly replace you file:

1. Locate your Windows operating system version in the list of below "Download security.dll Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate Xilisoft Video Converter Ultimate folder location:
   
   Windows XP: C:\WINDOWS\system32\dllcache\
   Windows XP: C:\Windows\System32\
   Windows Vista: C:\Windows\System32\
   Windows Vista: C:\Windows\SysWOW64\
   Windows 7: C:\Windows\SysWOW64\
   Show 8 more directories +

   Windows 7: C:\Windows\System32\
   Windows 8: C:\Windows\System32\
   Windows 8.1: C:\Windows\System32\
   Windows 10: C:\Program Files (x86)\Xilisoft\Video Converter Ultimate\Real\Common\
   Windows 10: C:\Program Files (x86)\Xilisoft\Video Converter Ultimate\Real\Plugins\
   Windows 10: C:\Program Files (x86)\Xilisoft\Video Converter Platinum\Real\Common\
   Windows 10: C:\Program Files (x86)\Xilisoft\Video Converter Platinum\Real\Plugins\
   Windows 10: C:\Windows\System32\
   
4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

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