games minimizing autometically and ngxt 500 error dialogue appears

Hi Siam, I can see how disruptive that must be when you’re trying to play. Based on what you described and the screenshots, this looks like a fake virus alert or pop-up from adware or a malicious script, not an actual Windows error. The 500 error and random messages are a sign that something is injecting these dialogs, often through a background process or a browser overlay. Since Defender isn’t finding anything, it could be a PUP (potentially unwanted program) or something running outside normal scan paths. First, check Task Manager for any unfamiliar apps when the pop-up appears and end those tasks. Then run a full scan with Microsoft Defender Offline or a trusted tool like Malwarebytes. Also, review installed programs and browser extensions for anything you didn’t install. If the issue started after installing something new, remove it. Can you tell me if these pop-ups appear only when you’re online or even offline? And do they show up outside games, like on the desktop?