To install windows XP, the computer needs to boot from the CD which is done by just pressing any key, once the key has been pressed the computer will check to make sure that all the components are there for the computer to work, once this has done the computer can then go through the next stages.
Then it will format the hard drive and install windows on to the computers hard drive.
The last part of the installation is to let the computer reboot and install the XP settings, such as networking. Once done the set up wizard will ask you if you want to registar windows. Then windows is ready to run.