What the heck is this?

Ok so what the poop is up with this??? I re-installed windows last night on my home machine and now the text on one of the accounts looks all crappy… it’s like antialiased or something, i don’t get it. Does anyone have any ideas for me? Because it looks yucky and it does it to fonts ont he internet too. ick!

The one on the left is the bad one, the one on the right is the normal one.