How to Fix the "Entry Point Not Found in api-ms-win-core-synch-l1-2-0.dll" Error

The error message "Entry point not found in api-ms-win-core-synch-l1-2-0.dll" often appears when launching certain applications or games, especially on older Windows versions like Windows 7. Here, we’ll explore why this error happens and offer solutions to fix it.

What Causes the Error?

This error indicates an issue with the api-ms-win-core-synch-l1-2-0.dll system library, which may be missing or corrupted. This DLL is essential for compatibility between certain applications and the Windows OS. The error is often related to trying to run applications developed for newer versions of Windows (e.g., Windows 10 or 11) on outdated operating systems.

Methods to Fix the Error

1. Update Windows to the Latest Version

If you’re using Windows 7, ensure you have installed all available updates. The error can sometimes be due to missing service packs or outdated system components. To update Windows:

  • Open Control Panel, navigate to Windows Update, and check for updates.
  • Install all available updates and restart your computer.

2. Install the KB2999226 Update (Universal C Runtime)

This update package contains components that can resolve issues with missing DLLs. KB2999226 is part of the Universal C Runtime, which is needed for compatibility between older Windows versions and newer applications. To install it:

  • Go to the official KB2999226 page and download the update for your version of Windows.
  • Install the package following the instructions, then restart your computer.

3. Reinstall the Microsoft Visual C++ Redistributable

Some programs depend on Visual C++ libraries, and reinstalling them may help resolve the issue. Here’s how:

  • Visit the Microsoft website and download the latest Microsoft Visual C++ Redistributable.
  • Install both the 32-bit and 64-bit versions if you’re running a 64-bit Windows.
  • Restart your computer after installation.

4. Manually Replace the Missing DLL File

You can try downloading the api-ms-win-core-synch-l1-2-0.dll file from a trusted source and placing it in the C:\Windows\System32 folder. However, be cautious, as downloading DLL files from unverified sources can be risky since they may contain malicious code. Only use this method if the others haven’t worked.

5. Use the System Restore Tool

If this error started recently, you might be able to fix it by restoring your system to a previous state when the error wasn’t present. To do this:

  • Open Control Panel, search for Recovery, and select Open System Restore.
  • Choose a restore point created before the error appeared and follow the on-screen instructions.