You need to to make sure the binaries for the kit are in your command execution path.
Start -> Control Panel -> System. Choose the Advanced tab. Click the Environment Variables button. Modify the Path in your System variables so that the directory containing javac and the other tools is included.
That's the way it is on XP, anyway. If you were using an actual operating system you would have been instructed on which file to go to and edit.
Make visible what, without you, might perhaps never have been seen. - Robert Bresson