Grub Overwrote my MBR :(

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http://forums.fedoraforum.org – Hey Guys, I'm wondering why this happened: When installing Fedora alongside an existing windows 7 installation, I specified to install grub to the boot sector of my primary partition /dev/sda3 (Where /dev/sda1 was my 7 bootloader and /dev/sda2 was 7 itself). Yet my master boot record was still overwritten. Is that the way it's supposed to work? If so, how would one go about installing fedora without overwriting the MBR, but still installing grub to the primary partition? Thanks (HowTos)