In The FullScreen When press ''Windows'' Minecraft closes

Please provide a description of the bug. If you mean Minecraft goes back to windowed mode, that's because pressing "Windows" opens your start menu; any application in fullscreen mode will be set to windowed.

If you mean you went into fullscreen mode and pressed the windows key - I have just tried it, no crash, turns back into window as expected.

This works fine on Windows 7 Ultimate with an Nvidia 560 Ti GPU.

If you're serious on this one you need to provide more details.

Please provide complete issue reports. See the guidelines here: http://help.mojang.com/customer/portal/articles/801354-writing-helpful-bug-reports-for-minecraft