It's most certainly in a graphics card setting somewhere.
The last time I updated graphic drivers, the font changed, and is 'orrible.
I think much of the problem is due to Folks fascination with using extremely high Screen Resolutions!
As a test, just changing my normal Sim Hardware resolution setting from 1280 X 960 X32, to 800 X 600 X 32, means that I can read all the Text on the Cockpit screen easily, without having to wear my Spectacles, and peer painfully at the Text throughout the Sim!
Much easier on the eyes...

...!
Paul...G-BPLF...FS 2004...FS Nav....

...!
P.S. ...what about increasing the Windows Font size?
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.