Yea nublet, it usually means that the font that contains that language has not been loaded. The cube means unknown character.
You can usually fix this by adding all the languages.
For XP go here -->> http://support.microsoft.com/kb/177561 <-- and scroll down to xp instructions.
For Vista go here -->> http://windowshelp.microsoft.com/Windows/en-US/help/52e368fa-bd32-4749-955e-331f9130889f1033.mspx
I hope this helps nublet :)