how to install IIS?

my computer is win xp professiional..
i try to IIS yester day by going to control panel->Add or  remove programs->
Add remove/Windows Components
after this there is a dialog box prompt out, and i  tick at IIS,and there is
 another dialog box prompt out and ask me to insert win xp sp1 cd to install
 the IIS.
so i to get a xp sp1 cd from my friend, but i dono how to install it by cd. 
is it there got any links can download the IIS?