This is a best Way to Customize your computer.In this trick you set a video as your background.
The concept behind is the Windows DreamScene.
We activate this feature on your Windows vista or windows 7.
This is very easy.
1. Download Windows Dream Scene activator.
Download windows DreamScene activator
2. Extract the file.
3. Run the file as administrator.
(It's very important.Else You can't be able to avail the feature.)
click on Enable DreamScene.
5. There you go.
Now you can put any MPG,MPEG or WMV video as your desktop background directly.You have to only
right click and set as DREAMSCENE and you go.
The concept behind is the Windows DreamScene.
We activate this feature on your Windows vista or windows 7.
This is very easy.
1. Download Windows Dream Scene activator.
Download windows DreamScene activator
Click On Download link Wait For Five Seconds and then press 
2. Extract the file.
3. Run the file as administrator.
(It's very important.Else You can't be able to avail the feature.)
4.
5. There you go.
Now you can put any MPG,MPEG or WMV video as your desktop background directly.You have to only
right click and set as DREAMSCENE and you go.