1. Turn off the computer and unplug it.
2. Remove the case screws at the back of the machine and open the side panel.

3. Remove all PCI cards from the PCI slots, except for the graphics card. Simply unscrew each card from the case and pull it out of the system.
4. Remove all but one stick of RAM by unlocking the retaining levers on the side of the chips and pulling them out of the system.
5. Disconnect the 'Data' and 'Power' cables from secondary hard and optical drives.
6. Start the computer, insert the Windows XP CD into the system and press any key to boot from CD.
7. Press 'Enter' followed by 'F8' to move to the installation screen.
8. Select the partition you wish to install XP upon (press 'C' to create a new partition, if none are available).