If you haven't already purchased Naruto Shippuden Ultimate Ninja Storm 3 on Steam, here's how to download and install the game:

Add the Naruto game installation folder to your antivirus to prevent it from happening again. 3. Reinstall the Steam Client

, it is usually because the file was either deleted, corrupted, or quarantined by your antivirus as a false positive.

Once the download is finished, close the Properties window and try launching the game. This method has a very high success rate and should resolve the error immediately.

How to Fix "steam_api.dll is Missing" in Naruto Shippuden: Ultimate Ninja Storm 3

Install Steam, log back in, and restore your steamapps folder.