I have dual operating system i.e Win XP and KUBUNTU. Now my windows XP is corrupted and i want to reinstall Win XP. So i just want to know Shall i have to reinstall Linux also or i can only reinstall win xp without affecting linux installation.
No problem, in general. Just make sure you don't accidentally format your Linux partition(s) as Windows doesn't recognize them. And you'll definitely will have to reinstall Grub, as Windows installs it's own bootloader no matter what.