Quick google search found this tutorial:
http://www.askvg.com/windows-7-servi...set-to-manual/
There are a ton of other tutorials on this issue. Whatever you do, I suggest being cautious when it comes to disabling services. Setting them to manual usually is enough to get rid of most of the completely unnecessary ones. Only disable those which you are absolutely sure about.
P.S.: You may clean your autostarts, too. Run "msconfig" and disable everything that does not have to start automatically with Windows.
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