If you wanna change the screensaver, you can update registry as follows{autoit script}:
RegWrite("HKEY_CURRENT_USER\Control Panel\Desktop", "ScreenSaveTimeOut",
"REG_SZ", "60")
RegWrite("HKEY_CURRENT_USER\Control Panel\Desktop",
"SCRNSAVE.EXE", "REG_SZ",
"C:\Windows\system32\ssText3d.scr")
RegWrite("HKEY_CURRENT_USER\Control
Panel\Desktop", "ScreenSaveActive", "REG_SZ",
"1")
RegWrite("HKEY_CURRENT_USER\Control Panel\Desktop",
"ScreenSaverIsSecure", "REG_SZ", "0")
I have updated HKEY_CURRENT_USER\Control Panel\Desktop\ScreenSaveTimeOut property in Registry manually but its not reflected in Display Properties Windows 8 GUI.
The result is that screen saver time out value shown in GUI takes precedences over the one in the registry.
When I update the GUI - the registry changes. It appears that this is a one way street - changes made from registry do not take affect the GUI although changes made from the GUI do take affect.
Finally, I found it worked after I restart the computer.But I don‘t know why, just do as this.
Change screensaver through registry
原文：http://www.cnblogs.com/jenney-qiu/p/3519004.html