Push new registre keys via group policy

[Clippy]

Recently I have added registry keys in active directory and I need to push them via group policy instead of going to each PC to apply the new ones.

How can I push new registry keys (not modify existing ones) via group policy?

Note: I'm using Windows Server 2003 64 bit and my clients are running Windows XP Professional.

[Clippy]

I solved but I didn't understand how it works!.I have windows 7 pro and I have installed administrative tools of 2008 in group policy management I created new policy so inside group policy management of windows 2008 there are new features for registry Computer Configuration --> Preferences --> Windows setting --> Registry from there you can push new policies but don't ask how I can use this feature and my windows server is 2003! if any one can explain to me?