Now unless you know what you are doing I would leave services as they are unless someone tell you it is safe to turn it of or set it to manual.
If using W/7 just type services into the start bar and it will show just click on it.
If xp go to control panel. Aministration.[ There maybe some thing after administration it has been a long time since I used it].Click on services.
You can set individual programs to Automatic.manual or disable.
But if you make a mess of it you may make your computer worse.