Full-Screen Windows Lock EXE

I need a small, stand-alone .exe file that, the moment it is launched, takes over the entire display—no taskbar, Alt-Tab, Windows key, or mouse clicks should get past it. Every keystroke and click must be swallowed so the user cannot interact with anything underneath... (Budget: ₹600 - ₹1500 INR, Jobs: .NET, C Programming, C# Programming, C++ Programming, Desktop Application, Python, Software Development, Software Engineering, Software Testing, Windows Desktop)