Screensaver not working on a VISTA-based computer.

Problem:
The screen saver does not work when you use a Microsoft wireless pointing device on a Windows Vista-based computer

Description:
When you use a Microsoft wireless pointing device that uses Microsoft IntelliPoint software on a Windows Vista-based computer, you may notice that the screen saver of the computer does not work even though it is configured to run.

Solution:
To resolve this issue, plug in a wireless receiver, and then check for updates.
To do this, visit the following Microsoft Windows Update Web site: http://windowsupdate.microsoft.com/
Install the Optional Hardware Update that is named Microsoft HID Non-User Input Data Filter.
Microsoft Link: http://support.microsoft.com/kb/911895