1. Copy DreamScene.dll to %windir%\system32
2. Copy DreamScene.dll.mui to %windir%\system32\en-US
3. Rename the file themecpl.dll in %windir%\system32 to themecpl.dll.original
4. Copy this patched version of themecpl.dll to %windir%\system32
5. Rename the file themecpl.dll.mui in %windir%\system32\en-US to themecpl.dll.mui.original
6. Copy this version of themecpl.dll.mui to %windir%\system32\en-US
7. Create a new folder in %windir%\Web named "Windows DreamScene" (without quotes).
This is where you can place your videos, for easy access through the Personalization control panel.
8. Import DreamScene.reg
9. Reboot (or kill explorer.exe and run it again).