I hope you were able to find a solution for your NIN game not opening after reinstalling Windows. If you haven't already, here are a few steps you can try to troubleshoot the issue:
Check for Updates: Ensure that both your Windows operating system and the game itself are updated to the latest versions.
Compatibility Mode: Right-click on the game's launcher or executable file, go to "Properties," and then try running it in compatibility mode for an earlier version of Windows.
Run as Administrator: Try running the launcher or game as an administrator to see if it helps with the issue.
If you're looking for Windows keys, you can find more information on this Reddit post. They have a lot of cool offers there.