Why can't I get my program to compile?

I'm very new to this, taking a class now, and I can't seem to get anything to work. I downloaded 1.4.1 and changed the path and so forth. At first, it didn't recognize javac, now it's saying it can't read the file on the disk. I have windows XP home edition and I just don't know what to do. I can't get ahold of my prof and I have an assignment to do. Any help will be worth a plate of chocolate chip cookies and a nice pat on the back. :D

Wow, I wasn't expecting such a speedy reply...all of them.
Let's see...I downloaded and tried to set up 1.4.1 and did just a simple Hello.java to see if everything worked. At first try, many hours ago, in the command prompt I typed it in and received a "javac is not recognized as an internal or external command operable program or batch file." Ok, I think I fixed that because at least it recognized it later. Then I recived an error message that read "cannot read file Hello.java, 1 error." I tried changing the path several times and even tried an autoexec file, which my prof said I didn't need to do because XP was beyond that. So, does that help clear anything up? I hope so.

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