How to reinstall windows XP without harming Redhat Linux?

I have installed Windows XP and Redhat Linux on my computer. My windows XP is corrupt. I am planning to reinstall XP but I dont know how to do it without doing anything. Last time when I formatted the drive where XP was installed, even my redhat linux got deleted. Please give me the complete instructions to reinstall Windows XP without harming Redhat Linux.