The Windows Vista default setting is to show the Welcome Center on startup. While the Welcome Center is mildly interesting the first time you see it, you will quickly tire of it appearing every time you boot your Vista PC. This behavior is easily changed by unchecking the Run a Startup button located at the bottom of the Welcome Center.
Underthe Windows Activation section there is a link: Change Product Key. Clicking that link brings up the screen shown in where you can enter in a different Product Key.
The icons located on the Windows Vista Start Menu default to large.
Click on the Change Plan Settings under one of the default plans to make changes.
For additional fine tuning click Change advanced power settings.