When you boot from the XP installation CD, you have the option of installing Windows to another partition than the default. You can change the partitions using that option. Delete the old C:partition, then recreate it and do an NTFS full format. You'll keep the other partitions, and anything corrupted on your system partition will be gone. If the hardware is OK, this should work, and the stuff on your other partitions will be safe.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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