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VERY VERY HARE TO READ
please REMOVE the htlm formatting
fedora 15 is End Of Life and unsupported
please grab a fedora 17 install dvd and do a clean new install
the windows install disks are notorious for formatting OVER a linux install and 100% removing them
( hence the ST references to "The Borg" and assimilating)
but if that did NOT happen then the windows install dvd DID replace a WORKING and 100% fine install of GRUB
with the Microsoft bootloader
let the fedora 17 install dvd do it for you
do you by chance have a VERY VERY useful tool ( SystemRescueCD )
you can use the EOL fedora 15 install dvd ( in rescue mode )
-- just fallow the on screen instructions -
and AFTER you type in " chroot /mnt/systemimage"
that will give you the drive layout
and you can find out IF win7 borg'ed you ( star-trek Borg )