NoClassDefFound error

I have a problem when I try to execute a java class file.
I get the NoClassDefFound error. I went in and set my Classpath in windows xp and pointed it to my bin. I am able to compile the program but when I try to run it I get the NoClassDefFound error. I have tried various means to get it to run.
I can see the class file in the directory I am in in the CMD prompt. I can not run any java class file.
Once again I have set the Classpath and am using the same version of compiler and java.exe. I am not adding the extension .class to the end I even tried Crimson Editor and set the java.exe path and set the argument to $[FileTitle].
I unistalled all my java and reinstalled it and still have problems with running any class file even the examples that java has included.
Any help would be gratefully appreciated.

set my Classpath in windows xp and pointed it to my bin.The above is incorrect.
Delete the CLASSPATH environment variable. Do not set it again until you understand how to use it. Read the documentation here to learn that:
http://java.sun.com/javase/6/docs/technotes/tools/index.html#general
Change to the directory that contains the .class file and use this command:
java -cp . <nameOfTheClass>
IMPORTANT: include the period and surrounding spaces.

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realising my stupidity I have solved the problem
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