This tutorial will teach you how to disable or enable the Windows Sidebar in Windows Vista. This will speed up your system, plus most people find it annoying anyway.
Go to Start and click Control Panel. Type 'sidebar' into the search bar, like so:

As you can see, after typing sidebar in the search, the Windows Sidebar Properties are all there is to choose from. Open up the Windows Sidebar Properties and be sure that this box is UNticked:

After unticking the box, press OK and restart your computer. Now, the Windows Sidebar has been disabled and will no longer run unless you open it up from the Control Panel.
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