Help the newbie of all newbies! Have a heart!

Please help me.
After i downloaded and installed the j2sdk1.4.0, i wrote a program and tried to compile it.
Since this is the first time i tried to run a program out of school, i have no idea what's wrong. in school we use unix, i have windows xp at home.
so i'm at the command prompt
c:\java>javac P5.java
(return)
the computer decided not to let me go through
'javac' is not recognized as an internal or external command operable program or batch file.
(said the computer)
i have no idea what this means, sorry if i come off as very stupid or ignorant. But please, please, some one help!
thanks, and wishes
jenny

This message means that the javac.exe file cannot be found. You could get round this by navigating to the jdk /bin directory and then run the command, but the best way is to add the /bin directory to your PATH environment variable.
To do that, go to the Windows XP Control Panel and click on System. Click on the "Advanced" tab and then on "Environment Variables". If there is a PATH variable already defined, then add your jdk bin directory to it (e.g. c:\jdk1.4\bin). If there is no PATH, add it.
This should enable you to run javac and java from any directory. To anticipate your next problem, you also need to set a CLASSPATH environment variable so that the JVM can locate your compiled java classes. There are lots of previous posts on this subject or you can post again.
Hope this helps.

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