The launcher for the data converter offered with PCGen points to "C:\Windows\system32\javaw.exe -Xmx256M -jar batch-convert.jar". However, the respective exectuable is not installed into that directory. Probably a better option would be to point to %JAVA_HOME%\bin\javaw.exe.
Windows 7 64bit, German
Previously, the installer was using the current folder for the javaw.exe location which could have been desktop etc. I have now changed it to use the SYSDIR, where the public jre's javaw is installed by default. Hopefully this should be more likely to be valid.
The JAVA_HOME value is not set automatically, so it cannot be relied upon to be present.