It is very easy to change your desktop wallpaper and screen saver, here is how:

1. On your desktop right-click your mouse
2. Click properties

Here you can change your desktop theme, you can play around with the themes and see which you like

    3.  Click the Desktop tab.

Here you can change your desktop wallpaper, you can even browse your computer for other pictures and use those as your wallpaper.

    4.  Click the screen saver tab

Here is where you can select the screen saver you want.  You can download new screen savers and they will appear here as well.