Paths etc etc

Hello, I'm a student who's just being introduced to java technology, and i have downloaded the latest java sdk, but cannot get it to compile or run any of my programs i get. I've read several forums about class paths and such, but i've tried setting classpath and path environment variables but it hasnt done anything at all. Can someone tell me what exactly to type in the environment varioables menu or command prompt for Windows XP so i can compile and run java programs?
thanks,

first of all, thanks a lot for your patience,
i've tried going to my computer/properties/advanced/environment variables and changing or adding PATH and CLASSPATH as C:\Program Files\j2sdk_nb\j2sdk1.4.2\bin , (im very sure these are correct pathnames) and then i try on command prompt
cd c:\
then i type:
javac HelloWorld.java
but it always displays
"javac" is not recognized as a batch file, etc etc
and i have several class files already that when i try
java HelloWorld.class
it displays
"no classdeffounderror helloworld.class etc etc
i've tried reinstalling the java sdk several times also, which didn't change anything.
at first when i installed it, i was able to compile several programs, until it started giving me error messages over and over again, and now i can't compile or run any programs. Any suggestions? thanks

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Paths etc etc

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