Cannot boot Kali after reinstall of win7 HELP

I have a dual boot set up with Kali and Windows 7 i recently Re installed windows due to a prob and now my pc boots stright to Windows 7 .no more kali it is still in the hard drive i tried the following
1.# fdisk -l (search for the partition where you installed kali: /dev/sda1, /dev/sda2, etc)
2.# mount /dev/sda1 /mnt (Mount the kali partition)
3.# mount --bind /dev /mnt/dev (You will need to mount the /dev directory into mnt)
4.# chroot /mnt (change the root to the mounted partition to be able to run the command from the mounted partition)
5.# grub-install --recheck /dev/sda (install grub in the HDD sda, not sda1, sda2, etc.., just sda

it says grub install not a command

You are doing it fine, just use a Live DVD or Live USB (Ubuntu or Debian). Remember that if you installed a kali 32-bit version, you will need a 32-bit Live from Ubuntu or if you installed 64-bit version, you will need the Ubuntu or Debian 64-bit version.