Font size on web pages has changed

Logging on to the internet, everything looks Ok except when I go to sites, the font size now appears in very large format. I checked internet tools and there is no font size shown, so I can't figure out how this happened. Have run anti-ad,virus, etc., my system is clean. .All my font settings on my desktop and IE header are normal. Can anyone tell me how to fix this? thanks.....Michelle.................

 

Also, you can change the size of the text by holding <ctrl> and scroling the mouse wheel. But that won't help much if the default is uber tiny.

Edit: D'oh! Didn't see Halo's second line.