ISOs: Boot Repair Disk

This tool is pretty straight forward. Here are step-by-step instructions just in case:

(1) Boot with Boot-Repair-Disk (included on Computer IT Repair USB, Linux Mint USB, Linux Best OS Collection Set, Linux Ubuntu USB, Linux Kali USB, Win Repair USB, Ultimate Penguin USB)
(2) Choose your language,
(3) Connect internet if possible (in rare instances - it may require internet connection)
(4) Click "Recommended repair"
(5) Unplug the USB Flash Drive with Boot-Repair-Disk and Reboot the PC, should solve the majority of bootsector/GRUB/MBR problems