Screensavers are a thing of the past in the utility sense - modern monitors do not "burn out" so there's no real need to change the image on the screen so often. Besides, turning off the monitor completely is better and more environment-friendly. Yet if you like screensavers and feel the need of some additional utilities for managing them, consider downloading the free Acez Jump Start Screen Saver.
Acez Jump Start Screen Saver is a tool that lets you load your screensaver on demand from the system tray. The yellow happy face of the icon representing the program lets you start your screensaver with a left mouse button click. It is much better than hanging around till three or five minutes go to see that your screensaver started so that you can leave your computer unattended safely.
Make sure you have a screensaver installed (and chosen under the appropriate display properties tab) so that the program would run correctly. Download this tiny tool today and check it out yourself.