Go to: Start --> Control Panel --> Administrative Tools --> Services
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Select, from the long list, which service you would like.
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Using the drop down menu, automatic/manual/disable that function. When in doubt, use "Manual."
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.