Are you getting errors trying to extract the archive or during compile like this? ('jar' or 'javac')

'jar' is not recognized as an internal or external command,
operable program or batch file.

This is because you need to manually setup your PATH variable after installing Java.

Open up the System Properties.

Open the Environment Variables.

Select 'Path' and click 'Edit...'.

Add to the end of the 'Variable Value' the path to your java 'bin' directory. Where this is depends on where you installed java and may be different from the example shown.

Once you have done this, click OK three times (once for each of the 3 dialog boxes open) and close any open DOS windows you have, everything should work.