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Windows XP Unattended Install

You can edit the file CD:\i386\winnt.sif to automatically enter CD key, accept EULA, etc. See MSFN for available options. Make an ISO of your Windows XP CD using UltraISO, and then extract the winnt.sif file, edit it, and insert the file back into the ISO.

After you have a PC imaged you'll need to use Sysprep to create a unique SID. At this stage the PC is ready to be imaged, or a snapshot taken in your VM before copying it.