HOW TO REPAIR GRUB BOOTLOADER AFTER WINDOWS INSTALLATION
ON DUAL-BOOT
LINUX MINT (17.x) – WIN 10

When you upgrade or reinstall your Windows OS on dual-boot computer with Linux Mint already on it, Windows will delete Linux GRUB Bootloader.

1. If you installed Win 8 or Win 10 then first disable Fast Startup in Windows. You can't make changes to disk if Fast Startup is enabled. Win 7 doesn't have that feature so you don't have to do anything.
I've found explanation for it on this webpage:
[ Ссылка ]

2. Reboot computer with Linux Mint boot USB or DVD and do the following:
- open Terminal (Ctrl+leftAlt+T)
- open Gparted
Go find detailed explanations on those webpages:
[ Ссылка ]
[ Ссылка ]

3. IN TERMINAL WINDOW TYPE FOLLOWING COMMANDS:
sudo mount /dev/sda7 /mnt
cd /mnt
sudo grub-install --recheck --root-directory=/mnt /dev/sda

4. REBOOT LINUX FROM YOUR HARD DRIVE
in Terminal window type in following command:
sudo grub-update

Thanks for watching!

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