lost access to windows after reinstalling grub2

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http://ubuntuforums.org – Hi, recently i installed windows 8.1 next to my linux installation (the harddisk was ready for it, i had the partition ready beforehand) then as usual windows took over the entire system, so I had to reinstall grub2 to regain access to my linux device (i had done this before, but it was already a year ago :)) so I looked up my linux partition sudo fdisk -l (mine was on /dev/sda5) i issued the sudo grub-install --boot-directory=/mnt/boot /dev/sda and after rebooting the system automatically boots into my linux install. so it seems grub2 took over the entire system now, but without giving me (Hardware)