Windows XP has a default screen saver setting with file login.scr This screen saver will run even when you select no screensaver option in Display Properties under Control Panel.

This default screen saver may be potential security risk, and hackers can remove login.scr and replace it with malicious screen saver with system privileges that could damage your files.

If you want to activate this little security option simply follow next couple steps:


1. Go to Start - Run
2. Enter regedit and OK
3. In Windows Registry editor navigate to
[HKEY_USERS\.DEFAULT\Control Panel\Desktop]
4. Search for "ScreenSaveActive" data key
5. Change the value to 0


Changing "ScreenSaveActive" data key to zero will disable default screensaver and if you ever wish to enable it back again, simply follow the procedure and set the value to 1.