.java to .class - what do I need - URGENT

I do not know java at all.
I need something to compile .java files to .class files.
A standalone program would be great (Windows XP)

You need, of course, the jdk. Go to java.sun.com and download the jdk (follow the jse links). While you are there go through all the basic tutorials before coming back with another question.
Also, do not mark a post as urgent. It only turns people away. It is not urgent to them. They are reading and answering these posts on their own time. Also, before posting a question, use the API documentations, the Sun tutorials, and Google generously before you post a question. When you then do post a question, tell us clearly and concisely what the problem is, and what you have already done to try and solve. Then include an example code that is small, and reproduces the problem. Doing this last step, will many times allow you to solve the problem yourself.

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