Use the Windows Key (Win) which is located in the lower right-hand side of your keyboard.
Win + Pause = System Properties
Win + D = Show Desktop
Win + M = Minimize all windows
Win + E = Launch Win Explorer (@ My Computer),
Win + R = Run Command
Win + L = Lock the screen
Win + X = Open Windows Mobility Center
Win + T = Shift through windows list in task bar (Win7)
Win + P = Change display output between Computer and Projector
Win + B = Let you select items in task bar’s tray
Ctrl + Esc = Start Menu (for those who use old keyboard)
Ctrl + Shift + Esc = Show Task Manager
Win + Shift + M = Maximize all windows
Alt + Spacebar + X = Maximize window
Alt + Spacebar + N = Minimize window
Alt + Spacebar + R = Restore
Alt + Tab = Shift between Windows (this one is trivial but do you know that Alt + Shift + Tab = Shift between Windows in reverse order ?)
Ctrl+ Shift + F10 = Shows Context Menu (Mouse Right Click Effect)
Application Specific (generally): Ctrl + S = Save, F3/Ctrl + F = Find
Desktop/Win Explorer: F2 = Rename File, F3/Win + S = Launch Search
-