Please HELP me with installation - java.lang.noclassdeffounderror:

Please Help! For school we need to install JAVA. I installed JDK 5.0 and id did not work. I got exception in thread "main" java.lang.noclassdeffounderror: hello. I was using Texpad to write, compile, and run it. In short I deleted all JAVA 5.0 using My Computer program removal. I installed JAVA 1.4..2_10 and I am still getting that same error. I want the JAVA 1.4..2_10 to be installed and not JAVA.5.0.
My System Variable CLASSPATH still shows C:\Program Files\Java\jre1.5.0_03\lib\ext\QTJava.zip. My System Variable PATH has nothing as far as JAVA in it. MY PATHEXT has JS and JSE amoung other things in it. My System Variable QTJAVA still has Files\Java\jre1.5.0_03\lib\ext\QTJava.zip in it.
Please tell me step-by-step how I can fix this. I never updated these variables before. What do I need to type and where? What do I need to get rid of or change?
PLEASE HELP!
Thanks,
Jim

I left my System variable classpath --> C:\Program Files\Java\jre1.5.0_03\lib\ext\QTJava.zip I left my QT JAVA --> C:\Program Files\Java\jre1.5.0_03\lib\ext\QTJava.zip I added Path --> ;C:\j2sdk1.4.2_10\bin and then restarted my computer. I added hello file in C:\j2sdk1.4.2_10\bin and tried to compile it under a new name and it would not compile. it gave me the error below. I was able to compile other java program in my other folder in a different directory. I am still getting the same error messages/ Anything else I should try? IS there anyplace or person I can call who would come and fix this? Something is wrong. This should not be giving me this much trouble. All The Java directions on other websites tell me to do different things. I am so confused... please help.
I get this during the compilenow:
javac: invalid flag: C:\j2sdk1.4.2_10\bin\helloa.txt
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are used
-classpath <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-help Print a synopsis of standard options
Tool completed with exit code 2
Jim
If you can fix this I will give you 14 points. I hope it is enough. I just want this to work for school.

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