GRUB bootloader fail

I've installed kali linux on a secondary partition with windows 7 professional. When installing, i had no internet connection so the GRUB bootloader did not install. Since the computer i'm installing kali linux on is not going to be connected to the internet, i have a external HDD that has 2 partitions, one for the live image and the other for personal files.

i'd like to know what to do now as i dont know of any way that this can be resolved.

Any help would be greatly appreciated as i havent got a clue what to do