Installer fails to start. It happens when UIDefaults.get is called with parameter FileChooser.upFolderIcon. If I make the same call from simple app it does not happen so it is probably caused by some modification on UIDefaults installer does. I patched JDK sources to get log of get/put calls with parameters. I will attach this log too. The same works fine on Windows XP. It happens both on JDK 1.5.0_09 and JDK 1.6.0 b99.
How to reproduce: Simply run installer exe downloaded from http://www.netbeans.info/downloads/download.php?a=n&p=1 select version 6.0, daily builds (actually it does not matter what version). To get log use command line option -is:log <Log file> eg. -is:log a.log.
I attached simple test app to reproduce this problem. If it is run in compatibility mode (I simply set compatibility mode for java.exe to Win XP SP2.) It throws AIOOBE when UIDefaults.get("FileChooser.upFolderIcon") is called in Win L&F.