After searching on the web, it seems like to solution is simple.
- Goto c:\windows\fonts
- Right click on the "Ming Liu" font and choose "Show".
- Reboot.
In order to prevent it happens again in the future:
- From "Start", type "control" to open the "Control Panel".
- At the top-right search box, type "fonts".
- Choose "View installed fonts".
- At the left pane, choose "Font settings".
- Uncheck "Hide fonts based on language settings".