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If you have the Windows XP Operating System CD with you all of you have to do is to make sure that the CD is set to 1st boot in your BIOS settings. Put your Windows XP CD in your optical drive and restart the computer. Watch the screen until you see the "Press any key to boot from cd.." if you see that press any key and it'll boot to the XP setup, wait for it to load and follow the instructions carefully.
some useful links http://www.windowsreinstall.com/winxppro/indexinstallguides.htm
make sure you have taken all the backup of your data from your system bcoz xp will not overwrite on vista you need to be format your drive which will erase your data. for installing windowx xp you need win xp cd as well as all the driver for win xp bcoz the driver is diffrent for vista and win xp .
if you have windows xp bootable cd just place in your cd-rom or in dvd rom .and go to bios setup (bios setup is just press the del button from your keyboard or f2 key it is display whrn you start your system )and change the booting sequnce from hdd to cd rom when it will boot from cd one massage will come press any key to continue just press the space bar and follow the setup instruction .
if you need more help let me know