I am running Windows 8.1 Pro on my laptop and bought 1 TB external hard drive so i can install kali on it. Microsoft has done a total mess with Windows 8.1. UEFI boot incompatible issues. I don't want to land in any trouble. Please refer to a step by step walkthrough of doing this without loosing anything on my windows. I have tried installing Ubuntu before and boot manager got corrupted. So, someone suggested me to flash rEFInd Boot Manager but that turned out to be very complicated. So, had to switch to only Ubuntu deleting windows. But Linux doesn't gaming needs even PlayOnLinux has too many issues so i don't want to remove windows this time. Please help and Thanks in Advance