To check if the problem is your java, go to Applications>Utilities and then open Terminal.
Type: java -version
If it says "Segmentation fault" then you need to install java again.
You can go here to get the files needed:
http://www.apple.com/support/downloa...2release2.html
(Tiger only. For 10.3.9, go here:
http://www.apple.com/support/downloa...acosx1039.html )