[Ctrl] + [C] Copy a select­ed item
[Ctrl] + [X] Cut a select­ed item
[Ctrl] + [V] Paste a select­ed item
[Ctrl] + [Z] Undo an action
[Ctrl] + [Y] Redo that thing I just undid
[Ctrl] + [A] Select everything
[Ctrl] + [P] Print
[Alt] + [Tab] Switch between open windows
[Win­dows-logo-key] + [D] Clear away every­thing and show the desktop
[Ctrl] + [Shift] + [Esc] Open Task Manager
[Win­dows logo key] + [L] Lock your PC or switch users
[Win­dows logo key] + [P] Choose a pre­sen­ta­tion dis­play mode
[Win­dows logo key] + [Plus Sign] or + [Minus Sign] Zoom in, zoom out

[Win­dows logo key] + [F] Search for files and folders

[Win­dows logo key] + [Shift] + [Click a taskbar icon]
Open a new instance of a program

[Win­dows logo key] + [F1] Get help

[Win­dows logo key] + [Down Arrow] Min­i­mize the window

[Win­dows logo key] + [Up Arrow] Max­i­mize the window

[Win­dows logo key] + [Left Arrow] or [Right Arrow] Com­pare and con­trast in a snap

[Win­dows logo key] + [Shift] + [Right Arrow] or [Left Arrow] Move pro­gram betwen two mul­ti­ple monitors 

SORUCE : http://windows.microsoft.com