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If you lost your Windows XP CD Key, these is simple steps to follow;
1) Insert Windows XP cd into a working computer.
2) Exit the Autorun introduction.
3) Open "My Computer"
4) Right Click on the Windows XP cd-rom drive and select explore.
5) Open the USWXP32P_ZX folder.
6) Open the sysprep folder.
7) Open unattend.txt
Your CD's product key is contained within the unattend.txt file.