Live Wallpaper for Lock Screen?

whats the difference between moving wallpaper and live wallpaper ?

edit--never mind i think i see what you mean--video on the log in screen or locked desktop

dont think so--if anyone does software to do it try stardock

http://www.stardock.com/products/

I dont believe you will be able to, the "tweaks" that you speak off are a registry entry to allow OEM's to customixe the ligon screen. Windows doesnt support anything other than the standard image format. There may be a third party solution but it seems to me that having a video or animation playing in the background when your PC was locked would be an unnecessary use of resources.