still, its a very strange kind of font problem.
there are very very very few fonts that won't display ASCII limited character set characters mostly correctly (ampersands aside...)
many of the characters that are not displaying correctly have standard ASCII codes that are found in almost all character sets, including Asian, Arabic, etc.
so, the problem needs to be something more than simply a Text Encoding display setting problem.
its likely therefore to be a system OS level Language setting that does not have access to even one font that can display its character codes.