Hi there! I see you're having some trouble with the Nebo app freezing and not opening anymore. Let's work together to resolve this issue.

First, could you let me know if you've recently updated the app or your Windows operating system? Also, did the app start crashing suddenly, or was there a specific action you took before it stopped working? Any extra details you can share would be helpful!

In the meantime, here are some initial troubleshooting steps you can try:

1. Restart Your Device: Sometimes, simply restarting your computer can resolve app issues. Go ahead and do that first.

2. Check for Updates: Open the Microsoft Store and check for any updates for the Nebo app. If there's an update available, install it and see if that helps.

3. Reinstall the App: If the app still doesn’t launch, uninstall it and then reinstall it from the Microsoft Store. This can help fix any corrupted files that might be causing the issue.

4. Clear Cache: If you continue to have issues, clearing the app's cache can sometimes help. You can do this through the Windows settings:
- Go to Settings > Apps > Apps & features.
- Find Nebo in the list, click on it, and choose Advanced options.
- There's an option to clear data/cache there.

Let me know how it goes after trying these steps or if you have any more information to share!