Win + TAB shortcut doesn’t work

        1.     Click Start button
2.     In search filed type Aero and open Aero Switcher


 
3.     Press Enable Aero

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One level up button not available in Windows 7..!!

It has already been taken out of Windows Vista and is also no longer part of Windows 7 OS.
As a workaround, please use the keyboard shortcut ALT + UP Arrow

Windows 8.1 Keyboard shortcuts

Here you can find the most usable shortcuts in windows 8.1....