Thanks for the quick reply,
Yeah that's exactly what I wanted to see.
On your screenshot it shows installed memory as 16gb. When I had 16gb it would show 15.9gb, and with 32gb it shows 31.9.
What you showed me on your first screenshot of task manger is normal, as it shows you have 16gb installed, but 15.9gb usable as it shows you have 52mb reserved memory (most likely for the bios)
This is what mine showed with 16gb installed:
It's completely weird because it's not reporting the ram correctly. I know some people may think say "it's only 100mb" but I'm. Not bothered about that, it's more the fact that it's bugging me that it's not displaying things correctly.
In my other rigs Windows 10 shows things the same as your PC. Infact I've not come across anyone else that shows anything different on installed memory. Some people might show 16gb (15.9 usable) for example, but they all show the correct installed physical memory.