Can't resolve problem. What's wrong?

Exception in thread "main" java.lang.NoClassDefFoundError
I get this everytime I try to run a very simple code, HelloDan.
class HelloDan {
public static void main (String[] arguments) {
System.out.println("What's the frequency, Kenneth?");
The file compiled correctly but like I said I receive this error everytime I try to run
java HelloDan
I'm using version jsdk1.4.2
on Windows XP
I did the echo %CLASSPATH% and received "C:\QTJava.zip"
could this be the problem? I looked for the zip file but couldn't find it..
Thank You

public class HelloDan {                                                                                                                                                                                                                                   

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