Below are a few steps you can try to fix the libwinpthread-1.dll missing error on Windows:

1. Install/Update MinGW or TDM-GCC:
- This DLL often comes from the MinGW (Minimalist GNU for Windows) toolchain.
- If you haven’t already, install or update MinGW or TDM-GCC so that the required libraries are properly installed on your system.

2. Add the DLL to Your Application Folder:
- If you already have MinGW installed, locate the libwinpthread-1.dll file (usually found in C:\MinGW\bin or wherever MinGW is installed / download libwinpthread-1.dll file from online).
- Copy it into the same folder as your executable. This ensures Windows can find it when the application starts.

3. Add MinGW to Your System Path:
- Open “Environment Variables” on Windows, then edit the Path variable.
- Add the path to your MinGW bin folder (e.g., C:\MinGW\bin).
- Re-open your terminal or restart your PC for the changes to apply.

4. Reinstall or Repair Visual C++/MinGW Distributions (if needed):
- Sometimes repairing or reinstalling the C++ redistributables/MinGW can help resolve missing dependencies.

By following these steps, you should be able to resolve the libwinpthread-1.dll missing error and run your application successfully.