How to go about Setting PATH and CLASSPATH?

I have problems compling the helloworldwww in the core programming.the error was:
Exception in thread "main"java.lang.NoSuchMethodError:main
my java programs are in c:\program files\java\bin
My path :
PATH=C:\WINNT\system32;C:\WINNT;c:\program files\java\bin
My classpath
set CLASSPATH=C:\WINNT\system32;C:\WINNT;c:\program files\java\bin.jar;.
is there any error in my paths, if yes how to i go about setting the path and classpath??Im running on winXP.j2sdk1.4.1_02.

set CLASSPATH=.;c:\program files\java\bin.jar;c:\program files\java\bin

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