hi plesea how can install win server 2003 dell poweredge r210 ii
First, realize that Dell does not support 2003 on the R210 II, meaning they offer no assistance to do so, and they offer no 2003 drivers for that system. That doesn't mean it won't work, but it may not. The "supported" method of running 2003 on this machine would be to first install a hypervisor (VMWare or Hyper-V) then install 2003 as a virtual machine.
Where are you stuck? What is your RAID controller? What is your drive config?