I am not positive, but I think that when you install a Microsoft OS, it "helpfully" wipes out any other OS that if finds on the hard drive. Or at least the MBR (so you would no longer see linux even if it was still there).
I have always been told to install Microsoft first, then fix your computer afterwards (lol).
BtW, I know that when Microsoft Windows 8 comes preinstalled on a computer, UEFI boot is enabled (I know, I had to deal with it recently when installing linux on an old friend's very first computer). Is that the case when a person installs that OS, as well, or only when the OEM does it?
Proud to be a Mint user running 64-bit Mint 17 XFCE.
"Change should never be your goal but, instead, only a means to reach your goal."