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.