The latest version of JRE(java runtime environment) is what you need to get that error message to go away. By going to the following website and downloading JRE for whatever system you have it will work. I reccomend not downloading the file but rather just opening from the site.

http://java.sun.com/j2se/1.4/download.html

Once on the site, scroll down to see which version you need. Hope that helps out a little. =)