Having spent most of the first weekend of 2016 trying to install a dual boot system on my aging ASUS N55S laptop, I thought I should recount my experiences, as a personal log mainly.
Fedora (23), first and foremost requires an extended partition on an OS. There are numerous tutorials out there, but the most n00b-proof one I found is here:
The reason for this is that the Fedora installer (Anaconda) needs to be able to create a number of volumes of differing sizes (/boot, swap, /home etc) and Simple Volumes, Logical Drives etc cannot support this (E&OE).
So, I created an extended partition in Windows 7, (which shows up as Free Space) and ran the Fedora installer (from a USB drive). It allowed me to create several partitions, for /boot, swap and / partitions but failed at the final hurdle BECAUSE:
MBR or Master Boot Record is gradually becoming replaced by GPT.