Shutting down XP services and gaming.

See the following site for tweaks
http://www.tweakhound.com/xp/xptweaks/supertweaks1.htm

Here is another solution that I use every time I play games. It is a batch file that automatically stops unneeded services so you don't have to do it manually every time. It is called Stop Services and is a free download from pc world.
http://www.pcworld.com/downloads/file_description/0,fid,23852,tfg,tfg,00.asp

It is easy to figure out the code and I have modified my copy to include even more unneeded services so you can suit it to your needs. It should help enough though right out of the box.

Use this link http://majorgeeks.com/page.php?id=12
it is a mirror of blackvipers page; which is currently down. there is a heading for gaming.