Sometimes the display settings on a MessageNOW or PlaybackNOW computer can be wrong, regarding the screen savers.  Below are a couple screenshots showing how to change them on Windows 7.  These are slightly different for Windows XP.

First right-click anywhere on your desktop and this menu will pop up.

Windows 7 Screensaver Setup Menu

Click Personalize, and then click on Screen Saver.

Screen Saver Settings Menu

Click on the drop-down box underneath Screen saver, and change to None.

Your screen saver is now off.