After finishing, reboot to see the effects of your tweaking.
Note: Do not use msconfig to stop services. It basically "disables" a service. Use the above procedure and set to "manual" instead for testing purposes.
If you like, you can also do: Start --> Run --> type in services.msc --> select OK.
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Windows Service Configurations!
Includes explanations of each service and advice on which services you can safely disable.