Hello Comunity

I'm quite new her so sorry if i make something wrong^^
I wantedt to make a ps/2 mouse out of my Arduino with this Library: ww_w.arduino.cc/playground/ComponentLib/Ps2mouse
(the link is changed because it's my first comment.)
Now startet Arduino 0018 and started the example from the Library.
But when I try to compile it it says:
c:/dokumente und einstellungen/.../arduino-0018/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected `)' before 'int'
Now I downloaded the Arduino enviroment 0012 because it was used on the site from the library. But when I try to start it with the run.bat it gives me this error masage:
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
Exception in thread "main"
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at processing.app.Preferences.getInteger(Preferences.java:750)
at processing.app.Editor.restorePreferences(Editor.java:420)
at processing.app.Base.<init>(Base.java:155)
at processing.app.Base.main(Base.java:104)
now I tried to start the .exe file directly but nothing happens :'(
only the process in the Task manager doesent dissapear and it uses more and more space but without effect for hours :-/.
Does someone know how to make a ps/2 mouse out of the Arduino with the 0017-0021?? Or can someone say me how to start it. :'(