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Re-installing windows should not harm Linux unless you let windows reformat the Linux partition. Be very careful. Windows may try to reformat the Linux partition for ntfs as a default option that you have to manually override.
However, windows will install it's bootloader to the MBR and you won't be able to boot Linux until you boot a liveCD or the Linux install CD to re-install grub.
My suggestion, make a boot disk for Linux before re-installing windows. Then, when windows is done, put the boot disk in the drive and reboot to get into Linux and re-instal grub to the MBR.
this is what i want to know... i am having the fedora dvd by which i had installed it...
now after reinstalling windows what should i do to reinstate the grub.
To make the boot disk (from Linux):
su
grub
root (hdx,y)
setup (fd0)
x=drive number, y=partition number (both starting from 0) e.g. /dev/hda2 is (hd0,1) in "grub-speak"
The drive and partition is the one where linux /boot is
After installing Windows:
boot into Linux with the boot disk
su
grub
root (hdx,y)
setup (hd0)
puts grub back into the MBR of the first drive
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