1. Insert the CD in your drive.
2. Right click it and select open.
3. Open the folder named I386.
4. In this folder there is a note pad file UNATTEND.txt
5. Open this file and browse till the last line.
6. You'll find there a original xp key.
7. Use this key while installing xp and there are 98% chance that your copy of XP will come out of Windows validation as a geniune copy.
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