Firstly, I tried to install Kali 2.0 from usb. Clicked install/graphicInstall. But it complained that there was no dvd disk with the packages in. Then, I went liveUSB and installed from there. I had Kali and Win8 on the disk. But grub didn't load. It just skipped to Windows. Then I tried to install Kali to another disk(SSD). But it just showed string 'Loading operating System...' and neither Grub, nor Kali started. By the way, I tried both EFI and non-EFI settings in BIOS. So, how to install Kali successfully? (I have kali persistence on one external disk and it works great!)
I would do It with non-EFI, as it is more compatible and gives less problems with Linux instalations.
I also would install grub in the MBR of the disk, /dev/sda.
You installed it in /dev/sda1 and so much the better, because I can swear that way Windows updates/reinstallations won't mess up with it.