I was just digging around in my backup CDs/DVDs from a few years ago and stumbled upon this program:
https://puu.sh/7goH4.png
(notice the text size)

It's a program from 2001. It was designed for Windows 2000/NT4/9X but (luckily) still works in Windows 8 and 8.1.

You can also change the caption buttons size without having to change the text size (though from the default size of 11 you have to since they can't go any smaller by default).

You can get it from here: https://dl.dropboxusercontent.com/u/...DisplaySet.zip