http://www.blackviper.com/2008/05/19/black-vipers-windows-xp-x86-32-bit-service-pack-3-service-configurations/the above helps you tweak windows to the bare minimum. clicks on <guides> and select your OS.
You can also goodle each item and see what it says. Need to also look at your printers and any other devices you may have connected.
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