Hi
1. Was it working fine earlier, if yes then do remember making changes to your computer recently?
Follow these steps to change the settings for screensaver timeout:
a. Right-click on your desktop and select "Personalize" from the menu that appears.
b. Click on "Screen Saver" in the Personalization menu.
c. Use the up and down arrow keys beside the "Wait" box to select the number of minutes you want the computer to wait before it activates the screensaver. You can also type the number of minutes directly into the box.
d. Click "OK" to finalize your settings.