BitmapToLCD.class should run on any system with Java 6 : just run java BitmapToLCD yourbitmap.bmp via the command line within the directory you've put BitmapToLCD.class. To store the output to a text file, run java BitmapToLCD yourbitmap.bmp > yourfile.txt
In Windows, you can access a command prompt by typing 'cmd' in Start -> run or 'window icon' -> search in windows 7. To move to a different directory use the 'cd' command. Move to the directory with your bitmap file and the BitmapToLCD file (above). For example, if both of these files are in C:\my_files\ , I would type cd C:\my_files
Then, we run the java program: java BitmapToLCD yourbitmap.bmp This will output the LCD matrix values to the command window. You can also output to a file. For example, you would type java BitmapToLCD yourbitmap.bmp > yourfile.txt
You can then copy that matrix into your Arduino .h file. Take a look at pony_bmp.h in GraphicExample if your're confused.