How to fix
Failure to load Sysmain.dll
on Windows

Hello. I get the Blue Screen of Death error and the message indicates that Windows cannot load the extensible counter DLL "C:\\Windows\\system32\\sysmain.dll". I have no idea what that means and how to solve the issue. I manage to run the machine normally, but sometimes I get the same error but the indication is related to ntdsperf.dll or rdyboost. I guess there are many files that trigger the issue. Can you help me stop this finally?

This failure to load Sysmain.dll in Windows can occur due to the incorrect dll files or missing data in the dynamic link library. The particular file location indicated in the error - C:\\Windows\\system32\\ should contain the proper DLL[ref en-1] to keep the machine properly running. 

The particular Blue Screen of Death error[ref en-2] can make users panic because the machine crashes due to various reasons. When the particular message indicates the trigger for the issue, users[ref en-3] can know the reason behind their computer failure. However, not every computer user can understand what that means and how to solve the issue.

To fix failure to load Sysmain.dll in Windows 10, users need to solve the DLL file problem entirely. Windows operating problems like this can also be triggered by a faulty upgrade or damaged files in particular system folders. You might want to run [d1] that could check and repair any altered or damaged files on the computer.

The particular issue is reported online y various users, and the Windows 10 versions indicated as having the issues vary. That can be the reason why the issue does not have one general solution. Registering the DLL file or replacing the existing file with the correct one could help with the problem.

Blue screen of death errors might occur on outdated versions of Windows, so you can consider upgrading the operating system. This could be one of the methods to fix the issue. Another option when dealing with Windows cannot load the extensible counter DLL "C:\\Windows\\system32\\sysmain.dll" can be checking for any recent changes on the machine. Make sure to try the methods listed below, do not skip any of them.

Option 1. Run SFC scan

• Search for CMD.
• Make sure to run the Comand Prompt with administrative rights.
• Once the black window opens, enter the SFC /scannow command and hit Enter.
  

  

  
  
• The process takes a few minutes, wait for it to e completed.
• You might receive possible solutions after the scan.

Option 2. Run the DISM commands

• Press the Start key and type the word CMD.
• Right-click on the command prompt and select to run it as administrator.
  

  

• Enter the following commands one by one followed by the Enter key:
  DISM.exe /Online /Cleanup-image /Scanhealth
  DISM.exe /Online /Cleanup-image /Restorehealth
  DISM.exe /online /cleanup-image /startcomponentcleanup

Option 3. Check for OS updates

• Click the Start menu and select Settings.
  

  

• Go to the Update and Security tab.
• To install the latest Windows updates, click on Check for updates and wait until they are found and installed.

Option 4. Troubleshoot the error

• Open the Settings and go to the Update & Security section.
• Select Troubleshoot on the left.
• Select BSOD from the right pane.
• Then click Run the troubleshooter.
• Follow the wizard.