1.Windows key+u+u=shutdown computer instantly.

2.rename quickly=select the file or folder,then press f2.

3.windows key+d=show desktop.

4.shift+delete=delete file or folder permanently(without going recycle bin).

5.windows key+tab key=you can work in taskbar without mouse.(by up-down......key).

6.alt+f4=close the window.

7.windows+e=open my computer.