How can I find out which model of Presario CQ56 I have?

[Jerono]

Please give the steps I need to follow when installing a second OS xp. I have windows 7 ultimate already installed. thanks.

 

[hang-the-9]

Your title and actual post don't match.
Before trying to install XP, go to Compaq's web site and check if your computer has XP drivers available.

Then http://www.sevenforums.com/tutorials/8057-dual-boot-installation-windows-7-xp.html