In windows environment, the hibernation is a built-in feature used to increases your work performance and also minimizes the windows startup time. For example, if you have to keep open a lot of files and windows applications then you can leave you system in hibernate mode without closing the open programs. When you restart computer after hibernation, all the running files and applications will be restore as you have left them. Windows store the all hibernated information in the Hiberfil.sys file using system root folder. The size of this file is roughly equal to the RAM of your system.
Follow the given steps to activate the hibernation in windows XP:
To use this feature, you will need to be logged into your computer with administrative rights.
First click on Start button> Control Panel, click on Performance and Maintenance then click on Power Options.
A new "Power Options Properties" dialog box will appear, select Hibernate tab and then select the "Enable hibernation" check box to enable the hibernate feature.
If you system does not support the hibernation feature then the hibernation tab will not available there.
Now click on Apply button to implement the changes then click on Ok button to end the configuration process.After enabling the hibernation feature click on Start button then click on "Turn off Computer". In the "Turn off Computer" dialog box, press the "Shift" for some time and click on Hibernate button. Your system will take some time to complete the hibernation process.