Hey there!
If you don't want to see words that are not in your language, you can go to "Options"->"Online"->Tick "Filter Foregin Language"
That way, it will not be seen. However, to solve the problem, you will need to install East Asian Language Support if you're on XP. For Vista and Windows 7, this shouldn't happen.
If you're in Vista or 7, try re-installing all the system fonts, one way this can be done is to use Window's System File Checker. To launch it, click "Start"->type "cmd"-> Right Click and Run as Admin-> type "sfc /scannow"
There might be a better way to reinstall all the system fonts but that's the only way I can think of right now.
Hope this helps!