Special Characters Display Problem in Safari on Windows

I like Safari very much so I use Safari on Windows, too.

But I found a very very weird problem about the characters displayed in Safari in some websites.

The most questionable website is www.renren.com, it's a social networking website like facebook in China.

And the questions goes here, contents maybe in Chinese.

Special characters in the webpage are displayed as a empty rectangle in Safari on Windows but normal in Safari on Mac OS.

Safari on Windows:

Safari on Mac:

Other web browsers like Chrome and IE on Windows works well, though.

Do you have any samiliar problem here?

I'm quite annoyed about this.