I'd do it the other way round.
Install all of your Windows operating systems and then install Linux Mint.
That's the way I installed Ubuntu and I've never had any boot problems. Note:
I installed Windows without that useless 100 MB boot partition.
When I boot my PC:
- I see the GRUB menu (showing Windows 7 and Ubuntu options)
- If I select Windows 7, I see the Windows 7 menu (showing Windows 7, W8 & XP)
I haven't physically installed Linux Mint, but I don't see any reason why it would be different.