DESCRIPTION: This is an nlited version of windows xp pro SP3 it has sata drivers for newer systems (this will load on about any vista machine out there) It also has Firefox and open office on it. It is an ISO so just burn to CD and use! (oh and for the people who are wondering, no you do not need a key to use this as it is set to where you do not have to enter it and you never have to worry about registering it)