If the XP cd doesn't work, and you have access to a system that can burn a cd, you can download gparted and burn it to bootable disk. Use that to delete the Vista partition, then install XP normally.
well buddy... how can u boot into an os, use its disk manager and try to get rid of that os itself!!! thats being too shameless
anyways, jokes apart..... you don't need to format the vista partition prior to installing xp. just boot from the xp cd, it asks for the partition to install on. jus select the vista partition and then choose the format option. there.. ur problem's solved!
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