sounds like your system path is messed up. cd is a built in command in the command prompt (it stands for "change directory"), but it's also an actual executable in your system folder (you'll need to figure out exactly where it's located). If your operating system doesn't know where to look for it, it will throw an error. This information is kept in a system variable called PATH, which is just a big string of paths separated by a colon or semi-colon (I forget which). This path tells your system which directories to look for executables when they are used as commands.

If you've never changed your PATH before, you should probably study it first. It's a pretty helpful thing to know about as a developer. How do I set or change the PATH system variable?

thanks I will have a look at that later

I am still having a problem with it and on all computers
My desk top (xp pro) my laptop and my friends laptop (Win 7)

all have the same message cant find CD
Is there an other way to test and play a java file

hey
Just watched a tutorial on youtube
Before I was typing cd into the run application but I think that might have been wrong
I have now typed it into the command prompt window and seemed to work but I cant see the directory the file is saved in
When i type c:\java or any other file i cant see it

I am on my lap top am now going to check it on a desk top

may you find a problem that happens before you activate it?

cd does not show you the files.
It switches the prompt to that path.

eg cd c:/java
would switch your prompt to C:\java > _Cursor_

Then the command dir will list the directories and files.
If your going to be doing things in command line, you should first be getting familiar with the commands and what they do...

XP reference Microsoft Corporation

Some more references
Windows CMD Commands