Hello,

first we need some more information:
* your phex version and launching method,
* your java runtime environment version,
* check the file %WINDOWS%\phex\phex.log for messages,
* try launching phex from a console window using java -jar phex.jar, are there any error messages?
+ deleting the contents of %WINDOWS%\phex is worth a try (if you don't need your previous configuration).

Helge