Stop Programs to Start Automatically When Windows Start

You can prevent a lot of apps forcing Windows into chilled-molasses boot times—without uninstalling anything.
Click Start, then "Run...," (Or Press Windows Key + R)
and type msconfig.
This brings up the System Configuration Utility window.
Click on the Startup tab to see a list of all the apps slated to start when you boot up Windows.
Click the check mark next to any you don't want, and then click OK to save your choices.
(Work in - Windows XP, Vista, Seven)