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Many hardware companies sell their systems with a windows xp recovery cd which makes it most of the time impossible to install that operating system on a different system. This forces the user to either buy a new XP system or at least a standalone XP Cd, that is, unless you do what I’m going to explain here. The following steps create a bootable standalone installation system for your operating system that is not connected to the computer you purchased it with.

http://www.ghacks.net/2006/11/07/upgrade-a-windows-xp-recovery-cd-to-a-full-installation-one/#more-899