I need a reinstallation cd or a download ple

Hello,
i need a reinstallation cd or a download of windows xp home edition 2p2 it came pre instaled on my computer
and i wase having trouble with my burners and i let some one how sade thay could fix it work on it big no no
i called microsoft but thay sade thay do not do cd's for cmputers older then 2003 or 2004 so that got me and i cant aford to pay for a new windows software cd i have my key jest need the reinstallation operating system cd
or a free download please help me thank you is all the key's the same for windows xp ? well i fond my kek on the back of my tower it is a sticker with a bar cod and key genuwon mircosoft