Can't Get Display to Go to Sleep



I have WinXP Pro SP3 and I can't get the display screen on a laptop to shut
down after the prescribed time. In Control Panel I go to Display and Screen
Saver and the click Power. I set Turn off monitor after 15 minutes. When I
go up to Power Schemes and click SaveAs I get error message "Indicates two
revision levels are incompatible." All updates are up to date. What could be
happening? The screen never shuts down.
Thank you


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