QUESTION :
Today I opened up my browser (Opera 11.60) and noticed that all of the font was italicized. There are still some text that isn’t italicized, but most of the text is italicized. I then opened up Firefox 9.0.1, and all of the font was bold. I looked at the Fonts in the Control Panel, and I have Arial Black, Arial Bold, Arial Bold Italic, Arial Italic.
So, does anyone know why this is happening?
ANSWER :
So downloading and reinstalling the fonts found in this post at sevenforums.com solved my problem! Just unzip the attachment, and copy over to the C:WindowsFonts.
So, try:
Go to Fonts Directory, Delete Regular Arial Font, reboot, and reinstall it.
Solved the problem for some lucky users.
Source: See Here Solved