I had separate partitions for Root(/)(30GB) and home(450 GB) for my fedora install! I wiped my home partition and re partitioned it to 100GB for a new install for windows and the rest for my home partition. After I installed windows and rebooted my laptop it didn't go into grub rather it directly booted into windows. the 30GB partitioned hasn't been wiped. I read on a forum that such windows install over-writes the windows bootloader over the GRUB and hence booting into Linux is directly possible! Kindly help as to how I can reinstall GRUB and continue using the wonderful Operating System that Fedora21 is! Thanks