ANSWER:

By default Windows 7 Paint applies Anti Aliasing to everything font related…. woop-de-do! But there is a way to turn this off via a little setting aptly named Smooth Edge.

Open up Advanced System Settings (Right click my computer, properties, then on the left hand side, Advanced Properties).

On the Advanced Tab -> Under Performance, click Settings -> under Visual Effects there is a check box for Smooth edges of screen fonts. That is the only way you can deactivate the AA in Paint, but this is a global setting, so all fonts everywhere won’t be Anti-Aliased or ‘Smooth Edged’.

by TheD from http://superuser.com/questions/437748