Hi there! I understand you're seeing a "Failed to start editing" error in the InstaSize app on your Windows device. Let’s work through this together so you can get back to editing smoothly.

First, can you tell me a bit more about when this error appears? For example, does it happen right after you open the app, when you try to load a specific photo, or while saving an edit? Also, have you tried any troubleshooting steps so far?

In the meantime, here are some general steps we can try:

1. Restart the App and Device
Close InstaSize completely, then restart your computer. Sometimes a fresh start clears temporary issues.

2. Check for App Updates
Make sure InstaSize is up to date. If you’re using a web version, try refreshing the page or clearing your browser cache. On Windows, some apps might cache data that can cause problems.

3. Clear Cache or Temporary Files
If you’re using a desktop app, clearing its cache can help. Since you’re on Windows, check if there’s a cache folder for InstaSize under your app data and clear it.

4. Check File Compatibility and Permissions
Sometimes the error occurs if the photo you’re trying to edit isn’t supported or is corrupted. Try opening a different image to see if the problem persists. Also, ensure InstaSize has permission to access your files.

5. Reinstall the App
If none of the above works, uninstall and reinstall InstaSize to refresh the app files.

If you can let me know which step you’ve tried or more details about your issue, I can guide you with more targeted help! How does that sound?