To get that code working you would need to first download the Java Development Kit (you can get it
here. Install JDK.
Copy the text of the code to a text file on your computer. You can place it wherever you'd like. Open up the java console (which you installed as part of JDK) run the command "java YourFilename" and that will comiple the program and give you a new file (you don't need the quotes and replace YourFilename with whatever you name the source code. Run that file with the command "java NewFileName" where NewFileName is the resulting file created from the last step. That should do everything.
Keep in mind that while I glanced the code over, it is not an official PokerTracker product, and the official fix which we support is forthcoming.