Preventing The Logon Screen Saver From Launching

To Preventing The Logon Screen Saver From Launching follow this step:

Start/Run/Regedit

HKEY_USERS\.DEFAULT\Control Panel\Desktop.

Value Name: ScreenSaveActive,
Data Type: REG_SZ (String Value),
Value Data: (0 = disabled, 1 =enabled). 

 Change the value of 'ScreenSaveActive' to '0' to disable the screen saver. Restart Windows for the change to take effect. Note: Windows has a default screen saver called login.scr, which runs even if no screen saver has been selected.