Click Start, point to Settings, and then click Control Panel.
Double-click Power Options.
Click the Hibernate tab, and then click to select the Enable hibernate support check box.
NOTE: If the Hibernate tab is not available, your computer does not support this feature.
Click the APM tab, and then click to select the Enable Advanced Power Management support.
If you are prompted to restart the computer, click No.
Click the Advanced tab.
In the When I press the sleep button on my computer box, click Hibernate.
Restart the computer.