If you want to block the Roblox website or app, or prevent Roblox from being downloaded on your Windows 11/10 computer, see this post.

Windows 11 shows widgets on the lock screen. If you want you can remove the Lock Screen Widgets in Windows 11 by following this post.

Microsoft has revised the lock screen in Windows 10 and 11 with a recent update that adds widgets, providing information about various things including the weather, the stock market and sports.

Just because you're still using Windows 10 doesn't mean you're safe from the new lock screen widgets. Open the Settings app on Windows 10 and go to Personalization.