Whenever I try to start the game through the desktop shortcut the cursor show the loading graphic for a second and then nothing happens, or through the browser the loading bar hangs at 100% and never actually starts the game. I made sure my graphics drivers and Java are both up to date, and I forwarded the ports on my router. I checked the registry key at HKEY_CURRENT_USER\Software\JavaSoft\Prefs\projectx and there are no values there except for something called "(Default)" which was not set to anything; not sure if this is normal or not, but it seems suspicious.
Could you please list the graphics card you are using and the driver version? If there's no values in the registry it means that the game has yet to launch successfully on your computer. Tweaks there will do nothing at this point.