According to the java web-site this may be to do with a corrupt font in your installation.

To get an idea as to which one it is, edit trio.bat in the bin directory and add "-Dsun.java2d.debugfonts=true" to the line that starts "java -X...". It should look something like:

java -X"bootclasspath:%TRIO_HOME%\lib\pja-mod.jar;%JAVA_HOME%\lib\rt.jar" -Dsun.java2d.debugfonts=true ...

And send me the output you get.

Cheers
Paul