download this
http://fpdownload.macromedia.com/get/flash...fp8_archive.zip
and install the latest version of Flash 8.0. Also make sure you completely uninstall version 9 using the uninstaller.
Right click on the pandora window and it should tell you your version.
Look at the Java window after it launches, it should tell you which port Jar is using. Mine said port 80 so i just type "http://localhost:8080" in my address bar.
Here what i did to get it working:
Downgrade Flash to 8r34
Upgrade Java to 6SE
Edit default.properties so the archive path is a existing path (my pc doesn't have a C: drive just F: and G:)
Mess around with NoScript plugin on FireFox
If it still doesn't work there's always LimeWire ;)