First of all, why is this necessary?
I'm pretty sure there already is a thread like this somewhere. It is of course possible they are deleted or that their layout isn't as 'nice' as this one, but none the less.. I think you can find more useful and detailed documentation on the internet with a simple search.
Secondly, if you want to teach someone something, make sure you know what you want to teach.
Also, don't focus on a specific Windows OS, or any OS for that matter. I'm referring to that calc related paragraph.
Just get rid of it and learn them how to manually convert hexadecimal numbers to decimal, octal and/or binary.
It would be nice too, if people didn't post tutorials containing "Coming soon..." sections.