Im not sure if this is a known problem.
Im running version 2.48.1 on windows xp and each session of using blender, after a while the normal character set changes to a set of ‘foreign’ letters
eg
I called the file ‘rotating blades’ and this came out = ÑÏÔÁÔÉÍÃ ÂËÁÄÅÓ.blend!
this applies to anyhwere I type (object names etc)
Any ideas?