If you are a user of Windows XP, you may not realize that there are many services that run in the background, many of which you will never use. This article from Extreme Tech is a great in depth series of tips that will help you get the most bang for your buck while running XP. Learn how to change and shutdown these hidden services, reduce boot time, and work to make XP as stealthy as possible.
http://www.extremetech.com/article2/0,1558,1785996,00.asp