Once you have fixed the missing DLL error using the official methods above, you can prevent it from happening again:
If your system files are corrupted, Windows has a built-in tool to repair them. Open the as an Administrator. Type sfc /scannow and press Enter .
Download both the (for 32-bit apps) and vc_redist.x64.exe (for 64-bit apps). Run the installers and restart your computer. 2. Run Windows Update api-ms-win-crt-synch-l1-2-0.dll download
You typically see this error for one of three reasons:
The most direct fix is to install the . This package contains all the necessary CRT files, including the synchronization DLL you are missing. Go to the official Microsoft Download Center . Once you have fixed the missing DLL error
A: Run a full antivirus scan immediately using Windows Defender Offline or Malwarebytes. Then, delete the manually placed DLL. Finally, follow Method 1 above to install the correct Microsoft version.
If only one program shows this error, its installation might be corrupted. Open > Programs and Features . Find the app, right-click, and select Repair or Change . ⚠️ Safety Warning Download both the (for 32-bit apps) and vc_redist
| ❌ Don't Do This | ✅ Do This | | :--- | :--- | | Download the .dll from a random website | Run Windows Update | | Copy the file from another PC | Repair Visual C++ Redistributable | | Ignore security warnings | Install KB2999226 (Windows 7 only) |