Click on START and in the "search programs and files" box (bottom left) type "msconfig" (without the quotes) and then highlight the program and run it. When the box opens, click on the Startup tab and uncheck every program that is not an absolute must to run when your computer starts.
Go here for more info: http://windows.microsoft.com/en-us/windows/optimize-windows-better-performance#optimize-windows-better-performance=windows-7
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