..eliminating the unnecessary startup programs and services.. The few such unnecessary programs that are running in the background, the fewer that have to shut down when turning the computer off. So, please follow the steps in the link below:

For Windows 2000/XP, ignore the first couple of sentences about checking "resources" and the "Performance tab" in the link below but follow the rest of the procedures including the "Services" links at the bottom.

How To Shut Down Unnecessary Start Up Programs

Hope this helps.