Today I want to add Hibernate feature to Vista?

And I can’t find it in the control panel / power management section. After google around then I found the solution.

To disable hibernation:
Click Start. Type “powercfg /hibernate off” and then Press Ctrl+Shift+Enter.
To enable hibernation:
Click Start. Type “powercfg /hibernate on” and then Press Ctrl+Shift+Enter.

A command prompt will appear and disappear. The program doesn’t give you any feedback anyway, so you’re not missing anything.
By press Ctrl+Shift+Enter is a shortcut to run a program as an Administrator.