Here's a method you can use to change the screensaver that displays on the login screen (if your user's settings don't automautically take over for you
).
WARNING: Editing the registry can cause damage. While although I have tested this and it does work without any side effects, I cannot guarantee that you will necessarily use this correct and thus will not be held responsible for any damage that you may cause to your computer resulting from using this tweak.
Click Start, and then click Run.
In the Open box, type regedt32, and then click OK.
In the Registry Editor window, locate the following registry key:
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