Boot into the XP installer with the XP CD. You are presented with a list of partitions and the operating systems (if any) on those partitions. Select your present XP install and choose not to update or repair but instead to delete that partition. You can then re-select the now empty partition, choose to install XP and you will then be prompted to format the partition before XP is re-installed. You can chose a quick or full format. Unless you have a problem with duff sectors on your hard dri ve the quick option is the one you want.
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