The supported platforms matrix has changed from Tiger to Mustang. Currently it says the following:

"Thank you for choosing the Java(TM) Platform. You may continue with this installation, but for best results we recommend running on one of the following operating systems: Windows XP, Windows 2003 Server, Windows 2000 with Service Pack 2 or later, Windows NT 4.0 with Service Pack 5 or later, Windows ME, Windows 98 Second Edition."

We need to add Windows Vista, drop Windows NT 4.0 and both win9X platforms. Other platforms may need to be added or removed before Mustang fcs's.