I'm guessing your problem is linking to Javac - the java compiler. It has been a while since i touched J creator and i am currently on a Linux machine so cant go into much detail, so the following is all from memory - bear with me:
- first you need to have the java SDK installed, you can get this from java.sun.com.
With this comes tha java compiler, called javac
I am not entirely sure of the path, you could search for it, however it will be in the bin directory of the java sdk directory (or whatever it is called). You need this path. Somewhere in the properties of jCreator there will be a path to compiler option, you need to copy that path and paste it in here. That should be all you need to do.
Does that help at all? or even is that what you were after? - if that is all correct it could just be problems with paths (i.e. not seeing the classes you created because the directories they are in are not within your classpath). Can you compile a simple hello world program. If not what errors do you get?