Activate EFS on Windows XP PCs with Windows 2003 Servers

Hello to all techyv people! I have some Windows XP SP2 computers and I need to activate the Encrypting File System (EFS) on all those.
I have been told I can be able to perform this with Group Policy without needing any physical access. Is that correct?
My servers are Windows 2003. These laptops can access the network only when I need to install important software's.
I made GP rules and some restriction policies on the software's that I used and it’s all working well until today.
So how I can activate EFS on my Windows XP computers?
Help please.
