Understanding error 1 error lnk2005 dllmain @12 already defined in msvcrtd.libdllmain.obj

By / March 15, 2023

DLL stands for Dynamic Link Library, and is a collection of modules that are used by various Windows applications.
DLL files contain objects and methods that are used by a program to perform a particular function.
DLL files are shared across different applications, and are used by multiple programs to perform a particular function.
DLL files can also contain other DLL files, which are used by that DLL.
Understanding DLL files is beyond the scope of this article, but in brief, DLL files are resolved and loaded whenever a program is launched.
DLL files are stored within the Windows\System32 directory.

  • The error 1 error lnk2005 dllmain @12 already defined in msvcrtd.libdllmain.obj appears when trying to install some programs.
  • This error is caused by a damaged DLL file, so reinstalling the software should fix the problem.
  • Renaming the DLL file can also help, so try that out if it’s your issue.

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    Delete the lnk2005 file.

    1. Go to C:Users > AppDataLocalMicrosoft > Software > Microsoft > Visual Studio > 15.0 > Visual Studio > Common7 > Visual Studio > 8.0
    2. Find the lnk2005 file.
      Find the lnk2005 file.
    3. Right-click on it, and select the Delete option.

    Reinstall .NET framework.

    1. Press Windows + R to open Run, type appwiz.cpl in the text field, and click on the OK button.
    2. Select the .NET Framework components, and press the Uninstall button.
      Select the .NET Framework components, and press the Uninstall button.
    3. Restart the computer.
    4. Update .NET Framework.
    5. Download the .NET Framework 3.5 Service Pack 1.
    6. Run the setup file to install it.
      Run the setup file to install it.

    Disable UAC.

    1. Press the Windows Key + R keyboard hotkey.
    2. Enter msconfig in Run’s text box.
      Enter msconfig in Run's text box.
    3. Click OK to open the System Configuration window as in the snapshot below.
    4. Select the Services tab.
    5. Select the Hide all Microsoft services option.
    6. Click the Disable all button.
      Click the Disable all button.
    7. Select the OK button.
    8. Press the Windows Key + R keyboard hotkey.
    9. Enter regsvr32 dllname.dll in Run’s text box.
    10. Input the dll name before the dll name.
      Input the dll name before the dll name.
    11. Press the Enter keyboard key.

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  • 1. Download and install ASR Pro
  • 2. Run a scan to find and fix errors
  • 3. Reboot your computer for the changes to take effect

    • Disable Windows Defender Firewall.

    1. To do that, press the Windows key + I to open Settings.
    2. Navigate to Update & Security.
    3. Select the Windows Security tab.
      Select the Windows Security tab.
    4. Under the Firewall section, click on Turn Windows Defender Firewall on or off.
    5. Now, toggle the button to Off and click Save changes.

    Run SFC scan.

    1. To do that, press the Windows key + X hotkey.
    2. Click Command prompt (Admin) to open its window.
    3. Enter sfc /scannow in the prompt, and press the Return key.
      Enter sfc /scannow in the prompt, and press the Return key.
    4. Wait for the scan to finish.

    Run DISM/DISM /Online

    1. In this method, you’re supposed to run DISM/DISM /Online, but the command must be replaced by the following command: DISM/online /Cleanup-Image /RestoreHealth

    Modify registry

    1. Open Registry Editor by typing regedit in the Search bar, and right-clicking on Run as Administrator.
    2. Navigate to Microsoft\Windows\CurrentVersion\WinSxS\Manifest
      Navigate to Microsoft\Windows\CurrentVersion\WinSxS\Manifest
    3. Find the folder with the corrupted file, and delete the registry key associated with it.
    4. Rename the corrupted file.
    5. Reinstall the problematic program
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    Use PowerShell

    1. Open the Windows PowerShell by pressing the Windows key + X hotkey.
    2. Click Windows PowerShell (Admin) on the Windows + X options.
      Click Windows PowerShell (Admin) on the Windows + X options.
    3. Input the sfc /scannow command in PowerShell with the administrator password.
    4. Press Enter to run the SFC scan.
    5. Then, the SFC scan will restart Windows.
    6. If the SFC scan rectifies the issue, you should regenerate some files that might have been corrupted, such as dlls, with the sfc /scannow /FORCE command.
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