I have just installed Eclipse 3.5 for Java EE developers (\"Galileo\").
I need to add an extra plugin, but when I select the \"Install New Software ...\" menu item,
I had the same problem in windows... and spent couple of hours to "somehow" install the new softwares.
Anyway I will explain you how I managed to install it after trying many options..
Even if it sounds crap... it worked for me..