italics! everywhere!

Today, I saw that Google's font is in italics and another website's font is in italics and some application's font is in italics; what a lovely coincidence! I had no idea how this happened, but fonts switched to italic mode without asking my opinion. The odd thing's that Firefox doesn't have this problem. For fixing this, I downloaded arial font and installed it. I was planning to download and install all vista fonts, but installing the arial font fixed the problem.