What are SHELL.DLL Error Messages?

Dynamic Link Library SHELL.DLL Errors

SHELL.DLL is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like SHELL.DLL, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like FileCoAuth.exe - to follow. These files were created so that multiple programs (eg. LAN Speed Test) could share the same SHELL.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 SHELL.DLL is attempted to be loaded either when LAN Speed Test is starting up, or in some cases already running. Some of the most common SHELL.DLL errors include:

• Access Violation at address - SHELL.DLL.
• SHELL.DLL could not be found.
• Cannot find C:\Program Files (x86)\LAN Speed Test v4\Libs\SHELL.DLL.
• Cannot register SHELL.DLL.
• Cannot start LAN Speed Test. A required component is missing: SHELL.DLL. Please install LAN Speed Test again.
• Failed to load SHELL.DLL.
• The application has failed to start because SHELL.DLL was not found.
• The file SHELL.DLL is missing or corrupt.
• This application failed to start because SHELL.DLL was not found. Re-installing the application may fix this problem.

Your SHELL.DLL file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with LAN Speed Test), or deleted by a malware infection. Furthermore, SHELL.DLL file corruption could be caused from a power outage when loading LAN Speed Test, system crash while loading SHELL.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 SHELL.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 SHELL.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 SHELL.DLL error, please proceed to the Step 2 below.

You can uninstall LAN Speed Test 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 LAN Speed Test 4.3.1 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall LAN Speed Test software.

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

LAN Speed Test 4.3.1

Totusoft

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many SHELL.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 SHELL.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 SHELL.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 SHELL.DLL file version. We maintain a comprehensive database of 100% malware-free SHELL.DLL files for every applicable version of LAN Speed Test. 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 SHELL.DLL Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate LAN Speed Test folder location:
   
   Windows XP: C:\WINDOWS\system32\dllcache\
   Windows XP: C:\Windows\System32\
   Windows XP: C:\WINDOWS\system\
   Windows 8: C:\Windows\System32\
   Windows 8: C:\WINDOWS\system\
   Show 6 more directories +

   Windows 8.1: C:\Windows\System32\
   Windows 8.1: C:\WINDOWS\system\
   Windows 10: C:\Program Files (x86)\LAN Speed Test v4\Libs\
   Windows 10: C:\Perl64\lib\auto\ActiveState\Win32\Shell\
   Windows 10: C:\Windows\System32\
   Windows 10: C:\WINDOWS\system\
   
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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