Vista - Website Fonts Too Small & Large

I turned on the computer yesterday, logged into my administrator account. And noticed when my MSN loaded, everything looked tiny. I went into Yahoo, same thing, I went onto Facebook but that was too large...Im the only one using the computer and I've gone through "Internet Options" and the "DPI" and nothing is correcting...I even uninstalled the last auto-installed service package and restarted numerous times and still no change, everything is either way too small of a font or too large. How to fix this? Please?