I kid you not, I'm just sitting here, with the standard font, I backed out of a folder and low and behold, my font has changed, I didn't mess with any setting, I like my standard font darnit, what on earth happened? The only thing I was doing at the time other than looking at pictures was uninstalling a game. Here's the new font, it placed itself on the desktop icons as well as the folders.
The pic is a little blurry because I had to resize it down so much, but basically it's all italicized.